I’m in an elevator with two other people. When it reaches the first floor, one person gets out and six get in. When it reaches the second floor, three people get out and twelve get in. At the third floor, five leave and nine enter. It rises to the fourth floor, one person gets on and the doors close. Suddenly, the elevator cable snaps and the car smashes to the ground. No one survives the fall, yet I’m alive and know exactly how many people go on and off the elevator at every floor. How is this possible?

How do you get from cold to warm in four steps, changing only one letter at a time to form a new word at each step?

What two-digit number is the square of one number and the cube of another?

A prisoner is told, “If you tell a lie we will hang you; if you tell the truth we will shoot you.”

What can he say to save himself?