How is the Rainbow formed?

During the rainy season you might have observed a bow shaped multicoloured strip in the sky. This is called rainbow. This strip has seven colours-red at the top and violet at the bottom. Other colours lie in between these two. How is the rainbow formed?The sunlight which appears to be white is actually composed of seven colours. These seven colours are-Violet, indigo, blue, green, yellow, orange and red. The wavelength-wise distribution of these...

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Why does the dog go mad?

 Dog is regarded as a faithful friend of man. But when it goes mad it is most dangerous. Biting by a mad dog leads to death if not treated properly. When a dog suffers from a disease called 'rabies', it goes mad. This disease is caused by a virus which is carried by the air or some wild animals and enters the dog's body through some cut or wound in its skin. The virus is bullet shaped having a diameter of about 70 millimicron and a length of...

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How do animals and plants survive in deserts?

A desert is an area where there is very little water and there is sand all around. Due to the scarcity of water, it is very difficult for animals as well as plants and trees to survive. Only those plants and animals which need very small quantities of water can survive in deserts.There is a great variation in the temperatures of the days and the nights of deserts. Days are very hot, while nights are cool. To protect themselves from heat, during the...

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What is hypnotism?

Hypnotism is an art, with the help of which the mental state of a human being is so changed that he starts working according to the directions of the hypnotist. Man has been using hypnotic power since ancient times. Previously, this was used to demonstrate some mysterious power, magic or miracles. Today, however, hypnotism is being studied in a scientific manner. This was started by Franz A. Mesmer, a doctor from Vienna. Hypnotism was known as 'mesmerism'...

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