John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

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

What is the centre of gravity?

What does Alexander the Great and Winnie the Pooh have in common?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

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

Why do Chinese men eat more rice than Japanese men do ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?