Replace the question mark with the correct number.

Why are televisions attracted to people?

What came first, the chicken or the egg?

What have one eye but still cannot see?

Which digit occurred maximum times between the number 1 and 1000?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

Replace the question mark in the picture below.

Who always enjoys poor health?

How can you tell a raw egg from a hard-boiled egg?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?