It is calcium phosphate, which forms tooth enamel. Like bones, tooth enamel is made from crystals of calcium phosphate…

When a candle is blown out, normally there is a burning ember in the wick that causes a ribbon of paraffin smoke to ri…

The amount of the dissolved gases in a soda bottle decreases as pressure decreases, hence, when you open a bottle the …

Each popcorn kernel contains a small amount of water stored in a circle of soft starch inside a hard outer casing. Whe…

It's called the Dead Sea because nothing lives in it. The reason for this is that it has some of the saltiest wate…

There are many reasons for white clothes to become dull. A common factor is hard water. Trace elements in the water can…

Hot air in a room rises because it is less dense. Windows and doors allow cooler air to come in and ventilators, locat…

For any material, there is a critical quantity of heat required before it can catch fire. The heat released by the burn…

Only the male cricket makes calls with its familiar chirp. Crickets communicate with each other by making a different s…

A white tiger is just an albino form of a normal tiger. There is no distinct species called a white tiger. It is simil…

In a speaker, an electromagnet is positioned in a constant magnetic field created by a permanent magnet. These two mag…

Mercury is also called quicksilver because of its silver like lustre. It has the symbol Hg (from the Greek hydrargyrum…

Rust formation is actually oxidation of the metal. The exposed surface of a metal plate gets oxidised –– for example, …

A match consists of three basic parts: the head, the tinder and the handle. The head contains more than twenty chemica…

DDT stands for Dichloro-diphenyl trichloroethane. It is very effective as an insecticide but is very toxic to fish, s…

Oxygen at 65% is the most abundant and carbon is next at 18.5%. 96.2% of the body weight of a human comes from ‘organi…

Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration. Osmos…

The itch that we feel as a wound heals is caused by the growth of new cells underneath the old scab. They form a new l…

When a boy reaches puberty the production of testosterone in his body increases (just as oestrogen production increase…

People who suffer from acidity often think that the cause of their problem is something in their diet. However, it is …