You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

There is something which is always coming but never arrives?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

A sundial has the fewest moving parts of any timepiece. Which has the most?