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

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What does this rebus means ?

PROG WORKRESS

What goes up but never comes down?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What part of the chicken has the most feathers?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?