A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

If your uncle’s sister is not your aunt, what relation is she to you?

Can you make a fire with just a single stick?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

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

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

Can you count the number of quadrilaterals in the picture below?