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[[Image:Yo-yo.png|thumb|Coca-Cola yo-yo from the 1960s.|235px|right]]
The '''yo-yo''' is a [[toy]] consisting of two equally sized and weighted disks of [[plastic]], [[wood]], or [[metal]], connected with an [[axle]], with a string tied around it. First becoming popular in the [[1920s]], "yo-yoing" is still enjoyed by children and adults alike. Yo-yos amuse children yet it is still a challenge to throw the yo-yo down and bring it back up again.


[[Image:Yo-yo strings.jpg|thumb|right|A bundle of yo-yo strings. The inset shows that each string is made of a single strand, twisted back upon itself. The yo-yo axle rests in the loop formed by the closed end of the string.]]

== Basic play ==

The yo-yo has been used for many centuries. To use, the player pulls the string through the loop to make a slipknot, puts his/her finger through the slipknot at the end of the string and grasps the yo-yo.
Generally, the player does not put the slipknot any farther up his/her finger than the first knuckle from the tip. Then the player throws it downwards with a smooth light motion. When it reaches the end of the string, the yo-yo can be made to "sleep," the axle of the yo-yo spinning within a loop of string. As the body of the yo-yo spins, a [[gyroscope|gyroscopic]] effect occurs, stabilizing the yo-yo on its [[Rotation|axis]] and permitting time to perform a number of movements. By flicking the wrist, the yo-yo can be made to return to the player's hand, with the string again completely twisted into the groove.

Generally, any movement or combination of movements which result in the return of the yo-yo to the player's hand in this fashion is considered a [[trick]], although this is not an absolute standard. Some tricks (such as the "Dog Bite", where the yo-yo is stuck to the player's pants) do not have the yo-yo return to your hand.

Yo-yoing is a popular pastime around the world. Although generally associated with children, it is common for people who gain a level of proficiency at the sport in youth to continue playing into adulthood. A yo-yo player is referred to as a ''yo-yoer'' (most common), ''yoer'', ''yoist'', ''thrower''," ''a flinger''" or simply as a ''player''.

== History ==

[[Image:Yo-yo player Antikensammlung Berlin F2549.jpg|thumb|right|280px|Boy playing terracotta yo-yo, [[Attica|Attic]] [[kylix]], ca. 440 BC, [[Antikensammlung Berlin]] (F 2549)]]

The yo-yo is thought to have originated in China, most likely traveling from there to Greece where it is first mentioned in historical records from c.500 B.C. These records describe toys made out of wood, metal, or painted terra cotta (clay). The terra cotta disks were used to ceremonially offer the toys of youth to certain gods when a child came of age&mdash;discs of other materials were used for actual play. Philippine historical records indicate that 16th century hunters hiding in trees used a rock tied to a cord up to 20 feet in length to throw at wild animals beneath them&mdash;the cord enabling retrieval of the rock after missed attempts. Some have theorized that this was the basis of the yo-yo, but it is more likely that the yo-yo traveled from China not only to Greece, but also to the Philippines.<ref name=spintastics1996>{{Citation
|url=http://www.spintastics.com/HistoryOfYoYo.asp
|title=History Of The Yo-Yo
|author=Valerie Oliver
|publisher=Spintastics Skill Toys
|year=1996
|accessdate=|accessdate=2008-05-31}} (includes photos)</ref>

The earliest surviving yo-yo dates to 500 BC, and is made using [[Terra cotta]] disks. A Greek vase from this period shows a boy playing yo-yo.<ref>{{Citation
|url=http://www.yo-yo.com/history_noflash.asp
|title=History
|publisher=yo-yo.com
|accessdate=2008-02-18}}</ref><ref>{{Citation
|url=http://www.spintastics.com/HistoryOfYoYo.asp
|title=History Of The Yo-Yo
|author=Valerie Oliver
|publisher=Spintastics Skill Toys
|year=1996
|accessdate=|accessdate=2008-02-18}} (includes photos)
</ref>

=== Origin of name and the Filipino/Philippine yo-yo ===
[[Image:1791-Yo-Yo-Bandalore.jpg|thumb|left|180px|1791 illustration of a woman playing with an early version of the yo-yo, then known as a "bandalore".]]

A popular belief is that the yo-yo was a weapon for over 400 years in the Philippines.<ref>{{Citation
|url=http://inventors.about.com/library/weekly/aa120297.htm
|title=The History of the Yo-Yo
|author=Mary Bellis
|publisher=inventors.about.com
|accessdate=2008-03-09}}
</ref>
However, the idea was debunked by the former president of the Filipino American National Historical Society<ref>{{Citation
|url=http://personal.anderson.ucla.edu/eloisa.borah/filfaqs.htm#yoyo
|title=Was the Yo-Yo really a weapon?
|author=Eloisa Gomez Borah
|accessdate=2008-03-09}}
</ref>
and by the chairman of the American Yo-Yo Association’s History and Collecting Committee.<ref>{{Citation
|url=http://www.yo-yos.net/Yo-yo%20history.htm
|title=Lucky’s History of the Yo-Yo
|author=Lucky Meisenheimer, M.D
|publisher=Yo-Yos.net
|accessdate=2008-03-09}}
</ref> Nonetheless, the allegation was used in a [[Diet Mountain Dew]] commercial in [[2008]] as part of the drink's "Surprising Facts" ad campaign.<ref>{{Citation
|url=http://dewcrew.repnation.com/ShareVideo.aspx?r=6803e4f0-25f1-4db5-9e02-95f381c0fbb5&i=2
|title=Diet Mountain Dew Surprising Facts - Yo-Yo Spot
|publisher=RepNation
|accessdate=2008-03-30}}</ref>

The principal distinction between the Filipino design and more primitive yoyos is in the way the yo-yo is strung. In older (and some remaining inexpensive) yoyo designs, the string is tied to the axle using a knot. With this technique, the yoyo just goes "back-and-forth"; it returns easily, but it is impossible, or nearly so, to make it "sleep".

In the Filipino design, one continuous piece of string, double the desired length, is twisted around itself to produce a loop at one end which is fitted around the axle. Also termed a ''looped slip-string'', this seemingly minor modification allows for a far greater variety and sophistication of motion, thanks to increased stability and suspension of movement during free spin.

Surprisingly, this innovation in the string design is useful even for "off-string" yoyo play, in which the yoyo is not attached to the string at all. The looped winding ensures that the free end of the string has no bulges, splices, or other non-uniformities, which can cause the string to jam uncontrollably in off-string play.

=== Birth of the modern yo-yo ===
[[Image:yoyo patent 1866.png|thumbnail|180px|right|U.S. patent #59745.]]

James L. Haven and Charles Hettrich (or Hettrick) received the first [[United States]] [[patent]] on "...an improved construction of the toy, commonly called a bandelore..." in 1866.<ref>{{US patent|59745}} dated [[November 20]] [[1866]]</ref>

However, the yo-yo would remain in relative anonymity until 1928 when a [[Filipino Americans|Filipino American]] named [[Pedro Flores (Yo-yo manufacture)|Pedro Flores]] opened the '''Yo-yo Manufacturing Company''' in [[Santa Barbara, California]].<ref name=flores>{{Citation
|url=http://www.nationalyoyo.org/museum/pedroflores.htm
|title=Pedro Flores
|publisher=National Yo-Yo Museum
|accessdate=2008-02-18}}</ref> The business started with a dozen handmade toys; by November of 1928, Flores was operating two additional factories in [[Los Angeles, California|Los Angeles]] and [[Hollywood]], which altogether employed 600 workers and produced 300,000 units daily.<ref name=flores />

=== The Duncan era ===
Shortly thereafter (''ca.'' 1930), an entrepreneur named [[Donald Duncan]] recognized the potential of this new fad and purchased the Flores Yo-yo Corporation and all its assets, including the Flores name, which was transferred to the new company in 1932. Duncan's first yo-yo thereafter was the Duncan O-BOY. [[Donald Duncan]] is reputed to have paid more than $250,000, a fortune by [[Great Depression|depression era]] standards. It turned out to be a sound investment, making many times this amount in the years to follow.

In 1946, the [[Duncan Toys Company]] opened a Yo-yo factory in [[Luck, Wisconsin]], prompting the town to dub itself 'Yo-yo Capital of the World'. Ironically, the very sign erected by the town advertising that fact contributed to Duncan losing its trademark.

=== 1960s resurgence ===
Declining sales after the [[World War II|Second World War]] prompted Duncan to launch a comeback campaign for his trademarked "Yo-Yo" in 1962 with a series of [[television]] [[advertising|advertisements]]. The media blitz was met with unprecedented success, and thanks in great part to the introduction of the Duncan Butterfly, the yo-yo was more accessible to the beginner than ever.

This success would be short-lived, however, and in a landmark [[trademark]] case in 1965, a federal court's appeals ruled in favor of the Royal Tops Company, determining that ''yo-yo'' had become a part of common speech and that Duncan no longer had exclusive rights to the term. As a result of the expenses incurred by this legal battle as well as other financial pressures, the Duncan family sold the company name and associated trademarks in 1968 to [[Flambeau Plastics]], who had manufactured Duncan's plastic models since 1955. Flambeau Plastics continues to run the company today.

=== The 1970s and the rise of the ball bearing ===

[[Image:Metallyoyos.jpg|thumb|200px|left|Modern yo-yos.]]

The 1970s saw a number of innovations in yo-yo technology, primarily dealing with the connection between the string and the axle. In 1978, dentist and yo-yo celebrity [[Tom Kuhn]] patented the “No Jive 3-in-1” yo-yo, creating the world's first "take-apart" yo-yo, which enabled yo-yo players to change the axle.

Soon afterwards in 1980, [[Michael Caffrey]] patented what would later become the Yomega Brain, a yo-yo with a centrifugal clutch transaxle. Designed with a free-spinning ball bearing linkage, "The Brain" could spin much longer than previous fixed-axle designs.<ref>{{US patent|4332102}} Filed [[October 27]], [[1980]]; Issued [[June 1]], [[1982]]</ref> In addition, the axle was "clutched" with spring-loaded weights which would pull away from the axle at higher speeds and grab again at lower speeds. The result is an automatic return of the yo-yo when speed drops below a given threshold.

Swedish bearing company [[SKF]] briefly manufactured novelty yo-yos with [[ball bearings]] in the 1970s.

In all transaxle yo-yos, ball bearings significantly reduce friction when the yo-yo is spinning, enabling longer and more complex tricks. Subsequent yo-yoers used this ability to their advantage, creating new tricks that had not been possible with fixed-axle designs.

=== 1990s technological renaissance ===
The 1990s saw a resurgence of the popularity of the yo-yo and yo-yo culture.

Continued development of yo-yo technology is evident in the widespread sale of the [[Yomega]] Brain, based on Michael Caffrey's design, and the Playmaxx Pro-yo, a take-apart fixed axle yo-yo.

In 1990, Tom Kuhn released the SB-2 yo-yo (short for Silver Bullet 2), a high-performance ball bearing transaxle made with aluminum. This marked a major breakthrough for the modern yo-yo, as it was the first ball bearing yo-yo that actually worked. This ensured extremely long spin times and the ability to return as well. This yo-yo, (along with his many other accomplishments in the yo-yo world), eventually brought him the title "Father of the modern yo-yo," receiving the "Donald F. Duncan Family Award for Industry Excellence" in 1998. He was the first to receive this award.

In the late 1990s, Yomega partnered with HPK Marketing and helped fuel the yo-yo boom that spread across the globe. From this partnership, Team High Performance was born, a group of skilled demonstrators that toured the world. In this period, Yomegas were heavily marketed in Japan, where Bandai produced several yo-yos under the Yomega name which were sometimes different from those sold in the US.

At the turn of the century, 1999-2000, Yomega partnered with McDonald's and distributed a large number of Yomega X-Brain and Firestorm yo-yos at outlets throughout the US.(blue)

== Contemporary yo-yo culture ==
===Yo-yo contests===
[[Image:Us yoyo national 2a.jpg|right|thumb|200px|John Ando, a 2A (double looping) division finalist at the 2004 US nationals in [[Chico, California]].]]

The International Yo-Yo Open is the largest yo-yo contest in the world. It is held every year in August at South Street Seaport in New York City. This contest is hosted by YoYoNation.com and aims to showcase the best yo-yo players in the world. In the inaugural 2007 contest, there were over 8,500 people in attendance and the event received almost 30 million media impressions. More information about this event can be found at YoYoOpen.com.

The [[World Yo-Yo Contest]] is held every year in Florida, USA during early August or late July. This contest takes the winners from national yo-yo contests around the world and pits them against each other. Countries such as the United States, Brazil, Japan and the UK hold competitions at the national and regional levels. In addition, national yo-yo contests, without regionals, are held every year by Mexico, Taiwan, Singapore, Hong Kong, Korea, France, Germany, Switzerland, The Czech Republic, Hungary, and Australia.

A yo-yo competition normally consists of two parts, a set of ''compulsory tricks'' and a ''freestyle'', where points are scored for each and the winner is the yo-yoer who scores the most points. Compulsory tricks (also known as a trick ladder) are a set of tricks that have been chosen before the contest, and the competitor must successfully complete each trick on their first or second attempt to score points. The freestyle is when the yoist performs a routine to their choice of music in front of a panel of judges, and is judged based on difficulty of the tricks, synchronization with the music and artistic performance.

The [[TV Times]] world yo-yo championship was held in the United Kingdom in 1974 with heats across the United Kingdom and a final in London in 1975, the championship was sponsored by the Louis Marx toy company with the 'Lumar' brand of yo-yo. The competition was judged by a celebrity panel in each city and also Lumar demonstrator and European yo-yo champion Don Robertson. The winner of the final was [[Simon Harris]] (intermediate category). The championship was not repeated.

[[Image:Us yoyo national 1a.jpg|left|thumb|155px|1A (string tricks) division finalist, Augie Fash, at the 2004 US nationals in [[Chico, California]].]]

=== Contest divisions ===
Currently there are seven yo-yo divisions to compete in:

*1A The player uses a long sleeping yo-yo to perform string tricks which usually require the manipulation of the string.
*2A The player uses two yo-yos simultaneously to perform reciprocating or looping tricks. This tends to be the most visually entertaining style with some players incorporating acrobatics into their routines.
*3A The player uses two long spinning yo-yos to perform tricks that involve manipulation of the string.
*4A The player uses an ''offstring'' yo-yo, often releasing the yo-yo into the air and attempting to catch it on the string.
*5A The player uses a yo-yo with a counterweight on the other end of the string rather than having it attached to a finger.
*AP This is Artistic Performance where the yoist uses any type of yo-yo or other prop in order to perform a freestyle.
*CB This is the Combined Division held only at the world competition, where players have to compete and demonstrate skill in multiple styles.

Competitors usually bring a number of yo-yos to the performance stage with them to allow for mid-routine replacements in the case of knots/jams (common with string tricks), string breakage (common with looping tricks), or drops (common with offstring tricks).

== Yo-yo techniques ==
=== Sleeping ===
Keeping a yo-yo spinning while remaining at the end of its uncoiled string is known as '''sleeping'''. Sleeping is the basis for nearly all yo-yo tricks other than looping, the player first putting the yo-yo in a "sleep" before throwing the yo-yo around using its string.

In competition, mastery of sleeping is the basis for the 1A division.

=== Looping ===
'''Looping''' is a yo-yo technique which emphasizes keeping the body of the yo-yo in constant motion, without "sleeping".<ref>[http://www.sciencenews.org/articles/20040417/bob9.asp Science News, Week of [[April 17]], [[2004]]; Vol. 165, No. 16, p. 250]</ref>

Yo-yos optimized for looping have weight concentrated in their centers so they may easily rotate about the string's axis without their mass contributing to a resistance due to a gyroscopic effect.

In yo-yo competitions, looping plays a strong role in the 2A division.

=== Off-string ===
In the '''off-string''' technique, the yo-yo's string is not tied directly to the yo-yo's axle, and the yo-yo is usually launched into the air by performing a "forward pass" to be caught again on the string.
However, some players can 'throw down' off-string yo-yos and catch it on the string just as it leaves the end of the string by pivoting the string around a finger as it unwinds, so that the yo-yo is caught on the string. This is exactly the opposite of a 'forward pass', but with the same result.

Yo-yos optimized for "off-string" tricks have flared designs, like the butterfly shape, which makes it easier to land on the string, and often have soft rubber rings on the edges, so minimum damage is inflicted on the yo-yo, the player, or anyone who happens to be standing nearby, should a trick go wrong.

Yo-yo competitions have the 4A division for off-string tricks.

=== Freehand ===
In '''freehand'''(5A) tricks, the yo-yo's string is not tied to the player's hand, instead ending in a counterweight. The counterweight is then thrown from hand to hand and used as an additional element in the trick.

Developed in 1999 by Steve Brown, as of 2008 freehand is considered to be the fastest-growing style of yo-yo play. Steve Brown was awarded a patent on his freehand yo-yo system, which was assigned to Flambeau Products ([[Duncan Toys Company|Duncan's]] parent company).

In yo-yo competitions, counterweight yo-yos are emphasized in the 5A division.

== Yo-yo shapes ==
[[Image:Classicyoyoshape.jpg|right|thumb|150px|Classic Yo-Yo Shape]]
[[Image:Technicprofile.jpg|right|thumb|150px|Modified Yo-Yo Shape]]
[[Image:DCP 0655 cropped.jpg|right|thumb|150px|Butterfly-shaped yo-yo]]

Yo-yo bodies come in a number of form factors or "silhouettes," each designed with specific advantages in mind. However, there are three popular configurations.

=== Tournament or Classic ===
The tournament or classic shape is often considered the original yo-yo shape, and is very commonly recognized. It's sometimes called a sculpted design. The shape's design is helpful in performing looping tricks.

=== Modified ===
The modified shape is a very popular design for looping style tricks. This shape is also known as a flywheel or modern shape. It usually has a hollowed face (sometimes covered with paper or plastic) with extra material left in the rim. The modified shape yo-yo is also used for string tricks because of the long spin times due to its shape.

=== Butterfly ===
Debuting in [[1958]], the butterfly has a wider string gap to make it easier to catch the yo-yo body on the string. The butterfly looks a bit like the separated halves of a standard yo-yo that have been reconnected back-to-back. Although the butterfly shape is good for 'string tricks,' it's not very good for 'looping' tricks. This shape is similar to a small [[Diabolo]], itself derived from the [[Chinese yo-yo]].

=== Other Shapes ===

There are, of course, many other shapes. Other less popular shapes are: Humphrey, Ball, Slimline, Russell Style (Bulge Face), Puck, Satellite, Coaster and Riveted Disk. <ref>Lucky's Collectors Guide to 20th Century Yo-Yos, 1999</ref>

=== Weight distribution ===
Each silhouette may have more weight distributed at either the center of the yo-yo or the rim. More weight towards the rim will make the yo-yo more stable for string tricks; more weight towards the center will make the yo-yo easier to turn and therefore better for looping tricks.

Heavier yo-yos will have more angular momentum when spinning at a given speed, and thus will spin freely for a longer period.

== Yo-yo innovations ==
[[Image:Two yo-yos.jpg|thumb|right|Two high-tech yo-yos, both take-apart models using the "modified" perimeter weighted body. The Veriflex on the left uses a ball bearing transaxle, with rubber O-rings to allow a variable string gap. The Playmaxx Pro-yo uses a replaceable wooden unit that acts as wooden axle and friction pad.]]
<!-- Image with unknown copyright status removed: [[Image:Speed_Dial.jpg|thumb|right|YoYoFactory Speed Dial Yo-Yo]] -->
=== Body ===
Some modern yo-yos are made from a '''"take-apart"''' design, designed to be taken easily apart and reassembled by the player. This design was created by Donald F. Duncan, Jr. This enables the replacement of yo-yo components, including the string, renewable friction sources, or even trans-axle components.

Some take-apart designs allow the player to reconfigure the yo-yo's halves. In the Tom Kuhn No Jive 3-In-1, the halves may be attached in three different configurations, resulting in a traditional, butterfly, or "pagoda" silhouette. In the Yo-yo Factory FlyMaster, the body has two different "shells" to convert to and from an off-string yo-yo.

Another innovation to the yo-yo is the ability to adjust the gap between the two halves of the yo-yo, in order to increase or decrease response. In most designs, this is accomplished by twisting the yo-yo halves, but some designs (such as the Tom Kuhn Silver Bullet) can be disassembled for adjustment without twisting. This second option eliminates the possibility of the yo-yo coming out of adjustment during play.

*John Jerome McAvoy, Jr. was awarded patents for the '''gap-adjustable yo-yo''': patent #5389029 on [[February 14]], [[1995]], and #6066024 on [[May 23]], [[2000]].<ref>{{US patent|6066024}} Filed [[August 4]], [[1998]]; Issued [[May 23]], [[2000]]</ref><ref>{{US patent|5389029}} Filed [[April 27]], [[1993]]; Issued [[February 14]], [[1995]]</ref>
*Harry Baier (creator of the "Mondial" yo-yo) and the Flambeau Products Company (owner of Duncan) were awarded patent #6162109 on [[December 19]], [[2000]] for a gap-adjustable yo-yo which has discrete positions for specific gap widths. This patent is now implemented in the Duncan Mondial.<ref>{{US patent|6162109}} Filed [[October 29]], [[1999]]; Issued [[December 19]], [[2000]]</ref>
*YoYoFactory's productline of Speed Dial yo-yo's feature "Fully Adjustable Starburst Technology" which allow the gap to be adjusted using a dial on the yo-yo. This allows for a more discrete response setting that stays the same after the yo-yo is taken apart and put back together.

=== Axle/bearing differentiation ===
The basic innovation since the 1990s is the '''transaxle''', a system where the string is not directly connected to the axle that connects the two halves of the yo-yo.

*'''Fixed''' axle yo-yos are represented by the original yo-yo design popularized in the first half of the 20th century, where the axle is directly connected to the string and halves of the yo-yo body. In order to enable the throwing of a "sleeper", the player must ensure the string is not wound too tightly around the axle, because it must freely spin in order to accomplish this move. Yo-yos designed for "looping" tricks tend to be fixed-axle yo-yos.
**Some more exotic fixed-axle yo-yos have axles made from low-friction materials such as ceramic alloys-- this allows for easier "sleeping," which is essential for string tricks.
*The majority of trick yo-yos sold are '''Bearing transaxle''' yo-yos. In these transaxle yo-yos the string is not connected to the axle directly, but rather it is wrapped about a [[ballrace]] bearing. The bearing, in turn, surrounds the true axle of the yo-yo. In this way, the body of the yo-yo may spin freely about the string's point of contact.
**There are transaxle systems which do not use a ball bearing, such as the Duncan ProFire and Yomega Fireball. These use a low-friction metal or plastic collar around the axle.
*The '''clutch transaxle''', innovated by Yomega with the Yomega Brain, is a transaxle that can be engaged or disenganged.
**the Yomega Brain is a '''centrifugal clutch transaxle'''-- when spinning at a sufficiently high speed, counterweights inside the yo-yo body disengage the axle, automatically allowing the yo-yo to "sleep." Conversely, when the speed slows below the threshold, the yo-yo will return automatically.
**Other clutch transaxles feature a manual switch which can engage or disengage the axle.

=== Friction sources ===
With the innovation of the transaxle, the notion of a yo-yo's '''response''' has become important to players. The "response" is a qualitative estimate of how easily the yo-yo will exit a "sleep" and return to the hand of the player.

*A '''starburst''' is a series of bumps molded into the surface of the plastic of each half of the yo-yo. The bumps form a star pattern, radiating out from the axle. Because the starburst is made of the same material as the yo-yo body, it tends to last the life of the yo-yo, but the yo-yo's responsiveness cannot be adjusted for the same reason.
*An '''O-ring''' response system is a rubber ring embedded in a recessed groove in the inside side wall of each half of the yo-yo body, surrounding the axle. Because it is made of a weaker material than the body, it wears down and is designed to be replaceable.
*'''[[Silicone]]''', like the O-ring, is a rubber component recessed into the side of the yo-yo around the axle.
*'''Friction stickers''', popularized by Duncan, are O-shaped stickers that affix to the inside wall of each half of the yo-yo body, and are slightly tacky to the touch. They are made to be replaceable. Many brands of friction stickers are now produced. Each give a unique feeling to the yo-yo. They are commonly made out of silicone, rubber, or a cloth material.
*'''Hybrid''',Is a combination of either O-ring and Starburst,O-ring and a Friction sticker,Starburst and a friction sticker and so on.This is mostly found in butterfly shaped yo-yos.Also it is mostly used by yoyojam.

===Side Bearing Caps===
Side Bearing Caps are when bearings are added to the hub of a yo-yo and covered with some form of side cap to allow it to be held while it spins. With the side cap bearing you can hold the yo-yo in many different planes and perform different styles of tricks, that can't be perform with the conventional yo-yos. Side Bearing Caps are also commonly known as side bearings, bearing caps (Anyyoyo) and hubstacks (Yoyo Factory).

=== Performance accessories ===
A number of yo-yo accessories are available as "after-market" modifications-- players buy items separately from the yo-yo to augment performance over the original model shipped from the factory.

*'''Ceramic bearings''' tend to spin longer and be more durable.
*'''Dif-E-Yo Konkave bearings''' are tapered inward on the perimeter, to force the string into a the center of the axle to prevent the string from rubbing on the sides of the yo-yo.
*'''Friction stickers''' different "grips" other than the ones shipped with the yo-yo, are available as a separate purchase to customize the user's style of play.
*'''Brake Pads''' Similar to friction stickers, however they break down quicker and can only be used in specific yoyos.
*High-tensile, '''Slick Strings''', generally made from polyester and cotton, is added by some players to improve sleep times (thinner string touches less of the yo-yo gap) and for better looping (low friction string performs "faster" and will not break as easily).
*'''Weight rings''' are affixed to the yo-yo's rim to increase the weight and percentage of mass at the yo-yo's rim, thus improving sleep time.

=== Exotic materials ===
Originally manufacturing yo-yos from wood, yo-yo technology improved in the 1960s when the industry switched to plastic. A plastic yo-yo has a uniform weight distribution and is unaffected by the variations in density that plague wood yo-yos.

Increasingly, the highest of high-end Yo-yos are being made of metal,
normally aluminum, steel, titanium, and very rarely, magnesium and tungsten alloys.

Exotic plastics are also coming into play: the "Milk," by manufacturer Born Crucial; the "Silk," by manufacturer Alchemy; and the "Gung Fu," by manufacturer Death by Yo Yo, are made almost entirely from the low-friction plastic [[Delrin]]. Yo-yos made from Delrin are also just as high end as metal ones.

== Physical mechanism ==
<!--(description of physics behind yo-yo)-->
The operation of a yo-yo comes from [[Moment of inertia|rotational inertia]] causing the string to be wound in the opposite direction returning the yo-yo. When the string is connected to the shaft with a loop, the yo-yo will continue to spin at the end of the string instead of returning, unless the yo-yo is jerked slightly allowing the slack string to bind and allowing return.

Patents have been issued to create more complicated mechanisms to allow tension control and an adjustable mechanism.<ref>{{US patent|6331132}} Filed [[July 27]], [[1999]]; Issued [[December 18]], [[2001]]</ref><ref>{{US patent|7192330}} Filed [[October 29]], [[1999]]; Issued [[December 19]], [[2000]]</ref>

== The yo-yo in popular culture ==
{{Refimprove|date=April 2008|Section titled ''The yo-yo in popular culture''}}
{{Trivia|date=July 2008}}
The yo-yo and "yo-yoing" have been a part of popular culture for nearly a century, and it is hardly surprising that yo-yos appear in many fictional works and even historical events.

*In [[1968]], activist [[Abbie Hoffman]] was cited for [[contempt of Congress]] for, amongst other acts, "walking the dog" during a session of the [[House Subcommittee on Un-American Activities]].
*In [[1974]] [[President of the United States|President]] [[Richard Nixon]] briefly played with a yo-yo at the [[Grand Ole Opry]] in [[Nashville]].
*A yo-yo craze features prominently in the 1992 [[Simpsons]] episode ''[[Bart the Lover]]''. In the story, a yo-yo manufacturer puts on an elaborate production of children doing yo-yo tricks in order to boost sales.
*Gregory House in the TV series [[House (TV series)|''House'']] is often seen playing with a yo-yo whilst pondering complex ideas.
*The Japanese [[manga]] ''[[Sukeban Deka]]'' (スケバン刑事 "Delinquent Girl Detective") features the adventures of Saki Asamiya, a girl who solves crimes, frequently employing her yo-yo as a weapon, which also conceals her police badge. The manga was later made into three live-action television series, three live-action feature films, and a two-episode [[anime]] series.<ref> [http://imdb.com/find?s=tt&q=Sukeban+Deka Sukeban Deka] at the [[Internet Movie Database]].</ref>
*In one chapter of the Japanese Manga [[Yu-gi-oh]], a gang uses Yo-yos as weapons during a yo-yo fad period.
*In the 2001 comedy ''[[Zoolander]]'', [[Owen Wilson]]'s character Hansel performs yo-yo tricks throughout the film.
*The fourth incarnation of [[Doctor (Doctor Who)|The Doctor]] (played by [[Tom Baker]]), in the long running [[BBC]] [[science fiction]] series ''[[Doctor Who]]'' is seen playing with a yo-yo from time to time. He claims in the episode "Ark in Space" that he is playing with the yo-yo to judge the [[gravity|gravitational field]] present on a [[space station]].
*In the ''[[Guilty Gear (series)|Guilty Gear]]'' [[video game]] series, the character [[Bridget (Guilty Gear)|Bridget]] uses a yo-yo as one of his main weapons.
*In the ''[[Earthbound]]'' video game series, the main character Ness can use a yo-yo as a weapon.
*In the [[Nintendo Entertainment System|NES]] video games ''[[StarTropics]]'', ''[[Yo! Noid]]'', and ''[[The Goonies 2]]'' the main characters use a yo-yo as the main weapon.
*In the MMORPG ''[[Flyff]]'' the Acrobat character class, along with the Jester subclass, can use yo-yos as a weapon.
*In the cartoon ''[[Recess (TV series)|Recess]]'' an episode features one of the main characters, Gretchen, learning to yo-yo, and then competing in a yo-yo competition.
*In the MMORPG ''[[RuneScape]]'' in the Christmas event of the year 2004, you were able to get a special toy which was a Yo-yo. It featured some of the tricks with a yo-yo as well.
*In the Japanese Anime [[Yu Yu Hakusho]], team Rokuyukai first fighter, Rinku is master of the Serpent Yo-Yo, an attack that transfers his spirit energy into the strings of the yo-yo causing them to act as if they are extensions of his own body.
*In the Japanese Anime [[Hunter x hunter|Hunter x Hunter]], Gon's best friend, [[Killua Zaoldyeck|Killua]] uses two yo-yos to fight.
*[[Tommy Smothers]] of The [[Smothers Brothers]] portraying the Yo-Yo Man.<ref>[http://www.smothersbrothers.com/yoyoman.html Yo Yo man]</ref>
*In One Flew Over The Cuckoo's Nest, one of the orderlies is seen playing with a yo-yo in the hallway towards the beginning of the film.
*The ''[[Detention (TV series)|Detention]]'' character Duncan is almost always seen with a yo-yo, and uses it to communicate with the other characters.
*In manga/anime; Super Yo-Yo. The yo-yos are used in dueling competitions. Which various kids in Japan challenge 5th grader; Shunichi Domoto to a yo-yo competition. Which eventually leads to a yo-yo tournament to determine the next "Yo-yo Spinner" (champion).
*In the video game [[Fahrenheit (video game)|Fahrenheit]] character Carla Valenti spins a yo-yo during thinking about the case.
*In the Japanese movie [[Yo-Yo Girl Cop]], by Kenta Fukasaku, the lead character uses a Yo-Yo as her primary weapon.
*In the video game, [[Ed, Edd n Eddy: The Mis-Edventures]], Eddy has a yo-yo as a weapon.
*In [[R.A. Salvatore]]'s [[The Cleric Quintet]] the main character, [[Cadderly Bonaduce]] uses "Spindle Discs" as a weapon. The description of this weapon making it obvious that it is a yo-yo.
*Dr. [[Lucky Meisenheimer]] has the largest collection of yo-yos in the world as certified by [[Guinness]]. He also has produced a periodic table of yo-yos.

==Notes and references==
{{reflist}}

[[Category:Physical activity and dexterity toys]]

[[ar:يويو]]
[[bg:Йо-йо]]
[[ca:Io-io]]
[[cs:Jojo]]
[[da:Yoyo]]
[[de:Jo-Jo]]
[[es:Yo-yo]]
[[eo:Jojo]]
[[fr:Yo-yo]]
[[gl:Ioió]]
[[ko:요요]]
[[hr:Yo-yo]]
[[id:Yo-yo]]
[[it:Yo-yo]]
[[he:יו-יו]]
[[lt:Jojo]]
[[hu:Jojó]]
[[ms:Yo-yo]]
[[nl:Jojo (speelgoed)]]
[[ja:ヨーヨー]]
[[no:Jojo]]
[[nn:Jojo]]
[[pl:Jojo (zabawka)]]
[[pt:Ioiô]]
[[ro:Yo-yo]]
[[ru:Йо-йо]]
[[fi:Jojo]]
[[sv:Jojo]]
[[tr:Yoyo]]
[[ur:یو یو]]
[[zh:溜溜球]]

Revision as of 20:44, 2 September 2008

the pope made it!

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