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Why do we always see the same side of the moon?

If you keep a chair in the center of a room and go round it in an anti-clockwise direction, it is your left side which will be turned towards the chair all the time. Similarly as the moon travelers round the Earth, its same side remains turned towards the earth. We see only this side. The other side always remains turned away from us.

• Nobody knew what the hidden side of the moon looked like until 1959. In that year the Russian spacecraft, Luna 3, passed behind the moon, took pictures and sent them back to Earth. It was found that the hidden side looked very much like side turned towards us.
• The color of something depends on the colors of light that it reflects. An apple looks red because when light falls on it, it absorbs all the other colors expect red. It reflects the red light so it appears red.

An object that reflects all colors appears white while an object that absorbs all colors appears black.

Color blindness

People who cannot see colors are said to be color blind, although in most of the cases, a person fails to recognize one particular color only. The most common from of color blindness is red blindness in which case a person is not able to distinguish red and green things.

Monkeys are the only mammals, besides human beings, who can differentiate all colors. Cows, bulls, buffaloes, goats, sheep, elephants, etc., cannot distinguish colors.

No one knows why, but more men than women are color blind. Women cannot suffer from the defect unless both parents possess the defective gene.

All the persons are not able to see all the seven colors of the rainbow with naked eyes. Only a few people can see the indigo part of it.

It takes a bigger section of the brain to operate a thumb than to operate the stomach.