I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

A blonde put eyeliner on her head. Why?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

What is the next number in this matchsticks series riddle?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Do You See It?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?