Science Projects And Inventions

YOU  NEED:

• A small coin

Turn your back and ask a friend to hold a One rupee coin inside the fist of any of his hands. Ask him to hold up the hand with the coin high above his head, even as he counts to 50. Now ask him to lower the arm and turn around.

Now ask the friend to extend both his hands where the back of the hands are up. Try and guess which fist hides the coin. You can guess correctly every time.

HOW DOES IT WORK?

Gravity makes the blood in the veins of the hand that is raised to come down. The downward motion of the blood causes the back of the hand that was held up to become a little lighter than the other one.