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.
Dimes, quarters, half dollars, dollar coins made before 1964 were silver. Modern, post 1964, coins are made of zinc or a copper/nickel alloy. Neither will attract a magnet. The only coins I know of that would stick to a magnet were the steel pennies made during the 1940 war years, when copper was being rationed.