You have a 5-gallon bucket, a 3-gallon bucket, and a water faucet. How can you accurately put four gallons of water into the 5-gallon bucket?

You are a prisoner in a strange land. You have been sentenced to death but are being given one chance to live. The king of the land has decided to let you play a simple game to determine your fate ...

A man is imprisoned in a ten-foot by ten-foot by ten-foot room. The walls are made of concrete, the floor is made out of dirt, and the only openings are a locked door and a skylight ...

You have a delicious round birthday cake. How many equal-sized pieces can you cut the cake into by making only three straight slices with a knife and without moving any of the pieces?

You are in an empty room with a glass of water. The glass is a right cylinder that looks like it is about half-full, but you are not quite sure ...