The first model of a ballpoint pen was patented in 1888 by an American, John H. Loud, for writing on rough surfaces. But a successful...

The inconsequential number zero was a major invention which has had a tremendous impact on the history of mankind because it made the...

We know that ordinary water is a compound of hydrogen and oxygen. It has two atoms of hydrogen and one atom of oxygen and is represented...

Since long, man has used clocks and watches to measure time. But those were crude watches and did not measure time accurately. A few...

It appears strange but true that astronauts can walk in the space. This is so because in ordinary walking, we rest our feet on the...

Ice columns appear in many caves or caverns. They are called stalactites and stalagmites. Stalactites are the stony deposits hanging like...

Do you know that about three-fourths of the Earth’s surface is covered with water? There are three main oceans — the Atlantic, the...

In the beginning, when man made boats, he also used them for the sea voyages. But he did not dare to travel too far because of the fear...

Weather is the day to day change in the state of the Earth’s atmosphere. Every day, we get weather forecast through newspaper, radio and...

The giant water waves which rise and fall periodically in the sea are called tides. Sometimes these tides are so high that they appear...

Generally, sea mountains are those mountains which are at least 1 kilometre above the seabed. A number of such mountains have been...

Dead Sea is the only sea on Earth which has no plant or animal life. It is, therefore, appropriately called Dead Sea. In fact, Dead Sea...

About three-fourth of the Earth’s total surface is covered with water; only one-fourth is land. The total area of the Earth’s surface...

Asthma is a chronic disease of the lungs in which a person has sudden attacks of shortness of breath, wheezing and coughing. It is one of...

When a person falls sick, the doctor often examines his pulse by placing his fingers on the wrist of the patient. What does this pulse...

Human life continues through the process of sexual reproduction. This involves the fertilisation of a female egg cell with a male sperm...

A dog, like a cow, an elephant, or man, is a mammal. All mammals are warm-blooded, or homothermic animals. In the animal world, only...

Many animals and creatures rest during the day but become active at night. Similarly there are many plants which bloom at night only....

Fly is a two-winged insect that has some 90,000 different species of it. The housefly (musca domestica) is one of the most common of all...

Anything exposed to the sunlight for some time becomes very hot, especially during the summer months. A scrap of paper or a piece of...