Didinium is a voracious hunter of live food, namely Paramecium. It is found quite commonly in freshwater habitats such as ponds and other still waters. It is in constant motion, swimming around in search of prey.
1938 S Jefferson Nickel. CoinTrackers.com has estimated the 1938 S Jefferson Nickel value at an average of $3, one in certified mint state (MS+) could be worth $50.(see details)...umismatic Value: $3 to $50.00. Value: As a rough estimate of this coins value you can assume this coin in average condition will be valued at somewhere around $3, while one in certified mint state (MS+) condition could bring as much as $50 at auction.
Jefferson Wartime Silver Nickels. So-called wartime nickels (as they are typically called by collectors and coin dealers alike) are special in a number of ways. Ironically, of course, there really is no nickel in these nickels. Yet, most people still refer to the 1942-1945 silver 5-cent pieces as nickels anyway.