Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

The more it dries, the wetter it becomes. Can you tell what it is?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

What is red and smells like blue paint?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

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?

It is always ahead of me yet I can never see it. What is it?

How can a man go eight days without sleep?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?