The gestation period for an elephant is 640 to 660 days. This is equivalent to about 95 weeks, or 22 months, and is the longest gestation period of any mammal.
Dimes dated after 1964 are copper-nickel clad and contain no silver. Quarters are also clad, except for the bicentennial commemorative coins with an S mint mark that were produced for mint and proof sets. Kennedy half dollars from 1965 to 1970 were 40 percent silver composition. After 1970, all Kennedy halves were clad, except the same S bicentennial issue.
United States Silver American Eagle. Since 1986 the American Silver Eagle has been the official silver bullion coin of the United States. These one ounce, 99.93% silver U.S. coins are popular in the United States and abroad. With silver values constantly increasing the demand for U.S. Silver Eagle coins is at an all time high.