On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What can go up a chimney down, but can’t go down a chimney up?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

What two things can you never eat for breakfast?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

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

The cream is heavier than Milk. True or False?