Drink can

The evolution of the beverage can:

1. The earliest kind of metal beverage can was made out of steel (similar to a tin can) and had no pull tab. Instead, it was opened by using a tool called a church key.

2. The second oldest kind is the same- except that the end pieces were made out of aluminum instead of steel.

3. The first kind of all-aluminum can was the same as its forebearers, which all still used the church key to open them.

4. The fourth age of the beverage can introduced the pull tab, which eliminated the need for a church key, as drinkers could now get teh things open with their hands. The original pull tabs were actually pop tops- the tabs came off in the user's hand- which allowed people to make curtains out of them by hooking the popped off tabs to one another to make a chain. Enough chains side by said and you had a curtain.

5. The next evolutionary development was a minor one: The fixed pull tab.

6. The sixth age of the can introduced the 'tapered end' can, which tapered slightly at both ends.

7. The most modern advance has been the 'wide mouth' can- the opening for the liquid to come out has been enlarged.