Where do you go to learn how to make ice cream?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Why do you find that most of the buildings are deprived of the 13th floor?

How can you make number one disappear by adding something to it?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Why is a river so rich ?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?