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?

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?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

I have Rs.50 and I spend it in the way as below.

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?

What runs around the whole yard without moving?