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Find the area of the shaded ...

Find the area of the shaded region accurate up to 3 decimal places. (A=?, a=1542)

Correct answers: 32

The first user who solved this task is Allen Wager.

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You can own a sheep, or ron...

You can own a sheep, or fleece it.

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Tin can key opener patented

In 1866, the first U.S. patent for a tin can with a key opener was issued to J. Osterhoudt of New York City (No. 58,554). Described as an "improved method of opening tin cans," the can featured a projecting lip and key.«*

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