Aryabhatta (476-550 A.D.), one of the world's greatest mathematician astronomer, was born in Patliputra in Magadha, modern Patna in Bihar. He was the first person who told that earth is round not flat.

Air, like any other gas, has volume. When you blow air into a balloon, the air takes the shape of the balloon. If more air is blown in, the balloon becomes larger as the volume of the air is increased. If some of the air is released, the balloon becomes smaller as the volume of the air is decreased. Air also creates its own space when filled in the things like balloon.

Qutub Minar is the world's tallest brick minaret at 237 feet (72.5 Meters) approx with the construction that began in the year 1199 by Qutbu'd-Din Aibak and was finished by his son-in-law Shamsu'd-Din Iltutmish (AD 1211-36).

It is the lightest planet. If there was a bath tub large enough to dip saturn, it would float on water. Saturn is the sixth planet from the sun and the second largest planet in the solar system, after jupiter

Nector is a sweet smelling substance that some flowers have. It attracts insects towards the flower.

Some animals such as cockroaches, grasshoppers and butterflies have special body parts, which help them to feel the changes around them. These are called antennae.

Antiseptic are the lotions and creams that kills germs. One should keep immediately on the wound or injury to kill germs.

These are the group of the stars, which resemble with the outline of animals or some other shapes. Such groups of stars are called constellations. For example, Ursa major, Scorpio, Orion, Leo, etc. Orion is in the shape of hunter.

Water proof is a type of material that does not let water go through it. Raincoats and umbrellas are made up of water proof material.

This sense organ helps us to feel things around us. It is the largest sense organ in our body as it covers our whole body.

They have sharp front teeth with which they bite nuts, fruits and seeds. These animal gnaw the food.

Veterinary hospitals are the place to treat sick animals. Veterinary doctors are there to treat animals.

These are scavengers. Scavengers are animals such as a bird or insect or plants that feed on dead or decaying matter. Both eagle and fungus feed on dead and decaying material. Eagles eat dead animals where as fungus grow on dead and rotten plants and take nutrients from there to grow.

Zebra crossing and pedestrian crossing both are the same, and is used to cross road when you walk on the road.

The person who weaves cloths are called weavers.