Before Mount Everest was discovered, what was the highest mountain in the world?

What building has the most stories?

Imagine you are in a room with no windows or doors. How will you get out?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Give it food and it will live; give it water and it will die.

How is the moon similar to a dollar?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What's a single-digit number with no value?