Can you convert the number zero(0) into a positive number using just one mathematical operator ?

John was piloting a plane behind a car but was never able to overtake it. Why?

In the image given, you can find several triangles. Can you count them all?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

When we see 2 but call 10?

What has many teeth, but cannot bite?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?