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The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar...

The lead–acid battery is a type of rechargeable battery first invented in 1859 by French physicist Gaston Planté. It is the first type of rechargeable...

Building material is material used for construction. Many naturally occurring substances, such as clay, rocks, sand, wood, and even twigs and leaves, have...

The mountain goat (Oreamnos americanus), also known as the Rocky Mountain goat, is a cloven-footed mammal that is endemic to the remote and rugged mountainous...

Protein tertiary structure is the three-dimensional shape of a protein. The tertiary structure will have a single polypeptide chain "backbone" with one...

In distributed computing, a remote procedure call (RPC) is when a computer program causes a procedure (subroutine) to execute in a different address space...

Foams are materials formed by trapping pockets of gas in a liquid or solid. A bath sponge and the head on a glass of beer are examples of foams. In most...

The windshield (North American English) or windscreen (Commonwealth English except Canada) of an aircraft, car, bus, motorbike, truck, train, boat or streetcar...

Diffusion-weighted magnetic resonance imaging (DWI or DW-MRI) is the use of specific MRI sequences as well as software that generates images from the resulting...

HIV/AIDS research includes all medical research that attempts to prevent, treat, or cure HIV/AIDS, as well as fundamental research about the nature of...

The blastocyst is a structure formed in the early embryonic development of mammals. It possesses an inner cell mass (ICM) also known as the embryoblast...

Chewing or mastication is the process by which food is crushed and ground by the teeth. It is the first step in the process of digestion, allowing a greater...

The slow movement is a cultural movement which advocates slowing down the pace of human life. It has been suggested that the movement emerged from the...

An internal link is a type of hyperlink on a web page to another page or resource, such as an image or document, on the same website or domain. It is the...

In computing, a crash, or system crash, occurs when a computer program such as a software application or an operating system stops functioning properly...

A pebble is a clast of rock with a particle size of 4–64 mm (0.16–2.52 in) based on the Udden-Wentworth scale of sedimentology. Pebbles are generally considered...

A dehesa (Spanish pronunciation: [de'esa]) is a multifunctional, agrosylvopastoral system (a type of agroforestry) and cultural landscape of southern and...

The direct sum is an operation between structures in abstract algebra, a branch of mathematics. It is defined differently, but analogously, for different...

A roaming user profile is a file synchronization concept in the Windows NT family of operating systems that allows users with a computer joined to a Windows...

Soyuz TM-20 was the twentieth expedition to the Russian Space Station Mir. It launched Russian cosmonauts Aleksandr Viktorenko, Yelena Kondakova, and German...