How many triangles are there on the puzzle below?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

You need to move three matchsticks to form three squares. Can you do it?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

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?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What is so fragile that saying its name breaks it?

How do you go from 98 to 720 using just one letter?