In order to solve the mysteries below you must ask the right questions. Think of this as the 20-question game. You may ask up to 20 questions and they must be answerable with yes or no.

1. When time stands still: As a burglar reaches for something on the mantel, he accidentally knocks over a clock. It falls to the floor; breaks, and stops. The next morning, however, police aren’t able to determine what time the robbery took place. Why not? (page 11)

2. Lunch Time: Robbie goes into a restaurant and orders a deli sandwich and a cola for lunch. Afterward, he pays his bill, tips his waitress, and goes outside. He slowly takes in his surroundings. The sky is black and the city streets are deserted. What happened? (page 12)

3. Egg Timer: Hard-boiling an egg takes approximately ten minutes, but it isn’t always as simple as that. Many factors can alter the time it takes. For example, in different parts of the world, hard-boiling an egg can take up to forty minutes. Why? (page 13)