What has to be broken before you can use it?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

John was piloting a plane behind a car but was never able to overtake it. Why?

How many letters are in the alphabet?

If six children and two dogs were under an umbrella, how come none of them got wet?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?