Answer:
What goes up and never comes down?
How do you make the number one disappear by adding to it?
A boy throws a baseball. It travels 40 feet and then goes right back to the boy. How is that possible?
Dora died at a very old age on her 24th birthday. How can this be?
What was the longest river in the world before the Amazon River was discovered?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.