Why are televisions attracted to people?
Prove that twice of ten is the same as twice of eleven.
What seven-letter word has hundreds of letters in it?
A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?
Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?
What can jump higher than a building?
What can you hold in your right hand, but never in your left hand?
They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?
Where do fish keep their money?
What part of the chicken has the most feathers?
What does an Island and the letter T have in common?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.