You must have seen a great num­ber of earthworms around your house, on the roads and on the playground after a rainfall. Most people think that they come out from their underground homes' after a rain because their bur­rows are flooded with water. But ...

The story of Noah's ark tells us that to save the earth he took a pair of every kind of animal on his ark and saved the earth from total destruc­tion. But if this could really have happened, then the ark must have been too big indeed! Becaus...

Birds, insects and some other ani­mals have wings which help them reach from one place to another faster than us.

Insects are very light and can fly very fast. The flying speed of most of the in­sects is about 25 to 35 miles per hour. Scientists ...

Many extraordinary things exist in nature. Insects and animals change their size and color according to their requirements. In nature, 'camouflage ‘means a disguise is used by animals or plants to conceal themselves from their enemies. And one of the best camouflages ...

The huge sized reptiles called lived on earth millions of years ago. But all of them were not as big as some dinosaurs of the biggest ones. Dinosaurs existed in a great variety of sizes. Most were 25 to 30 feet long and weighed from five to ten tons. Som...

Huge reptiles called Dinosaurs lived on earth about 180 million years ago. They flourished and ruled the earth for more than 120,000,000 years. But today we can't see even a single one of them, because all of them died out about 60 million years ago. ...

The subway or the under­ground train was built in Lon­don in 1863. It was 31/a miles long and the carriages were pulled by locomotives running on coal inside the tunnel. London was the only city in the world with a tube railway until 1891, when another one w...

To fly in the air had been man's dream for age's. Before 1903, flights in balloons and gliders had been tried successfully. But the first successful aircraft was designed and used by two brothers. Orville and Wilbur Wright. At about 10.30 in the morn...

Saliva is a watery, colourless fluid which is produced by some glands inside our mouth. It contains 98% water and 2% enzymes. The most important enzyme is ptyalin which helps us in digesting the food we chew and eat. While chewing, the saliva joins the food an...

To make use of the starch and sugar our body needs a substance called insulin which is produced by the pan­creas gland in the body. Insulin con­trols the sugar metabolism so that the blood-sugar level remains within a certain range no matter what the in­take or ou...