How can a man go eight days without sleep?

What can you deduce from the following BrainBat?

CRY
LMKI

Which is heavier: a ton of bricks or a ton of feathers?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What will you call your mother's brother's brother-in-law?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?