It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

What is the next number in this matchsticks series riddle?

What work can one never finish?