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.
My quarter rocks. 1964 was the last year for coins minted entirely of .999 silver, however, some coins were still minted with ,90 silver up until I think 1982 or so. If you can find a 1982 dime with no mint mark it is worth about $350 in any condition. That was the year that somewhere between 30,000 and 300,000 coins were minted at the S.F. Mint but the die for the mint mark wore off. Making the coins valuable for having this flaw.