A person can live without food for about a month, but only about a week without water.

Sterling silver is not pure silver. Because pure silver is too soft to be used in most tableware it is mixed with copper in the proportion of 92.5 percent silver to 7.5 percent copper.

The numbers '172' can be found on the back of the U.S. $5 dollar bill in the bushes at the base of the Lincoln Memorial.

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