If you say my name, I will no longer exist. What am I?

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

How many letters are in the alphabet?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What is the riddle which can be asked all day with a different correct answer each time.

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?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

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?

I have an eye but still cannot see.

Who am I?