Answer:
What was the longest river in the world before the Amazon River was discovered?
What is the difference between yesterday and tomorrow?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
If you have 30 white socks, 22 black socks, and 14 blue socks scattered across the floor in the dark, how many would you have to grab to get a matching pair?
In 1990, a person is 15 years old. In 1995 that same person is 10 years old. How is this possible?
My days are numbered. What am I?