Answer:
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
What goes up the hill and down the hill, And spite of all, yet stand still?
10 fish are in a tank. 2 Drown, 4 Swim away, and 3 Die. How many are left?
What can you stick between a 3 and a 4 so that the result is more than three but less than four?
Why can't Kevin, who is now living in Canada, not be buried in the USA?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.