The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

Why do we preferably have round manhole covers and not square ones?

When 99 is considered higher than 100?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Can you identify the hidden rebus in the image below?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

You are given a set of weighing scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other. The 12 marbles appear to be identical. 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more. Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light

How could a baby fall out of a twenty-story building onto the ground and live?