Eight of us go fourth, not back, to protect our king from an attack. What are we?

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

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

O T T F F S S ?

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

What always comes into a house through the keyhole?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Forwards I am heavy, backward I am not. What am I?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?