I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Can you solve this picture maths equation?

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 am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What have one eye but still cannot see?

The more of this there is, the less you see. What is it?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What is the Surname of Barbie Doll?

If a wheel has 54 spokes, how many spaces are there between the spokes?