Which is heavier: a ton of bricks or a ton of feathers?

What can you hold in your right hand, but never in your left hand?

What happened when the wheel was invented?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Can you count the number of squares in the given picture?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.

How can you drop a raw egg from a height onto a concrete floor without cracking it?