You could say b a use they are both spacecraft. However, the right water is that they are both made of ceramics. Saucers are made of ceramic material called porcelain, and the space shuttle is covered with ceramic tiles that resist the intense heat of re-ent...

Wood becomes waterlogged when all its cells are filled with water. It can absorb water only up to about 30 per cent of its own weight. As it does so, the wood swells until it reaches "fibre saturation point" or its maximum volume.

If further wate...

Stainless steel resists rust because it contains a high proportion of chromium to carbon. Before the arrival of this alloy just before the First World War, knives and other household articles made of steel easily rusted unless very carefully dried.

If you stood on the shore looking across, the sea to the horizon (the line appearing to separate earth fro (sky), you might be able to see about two and half miles. But the higher you stood the further you would be able to see. As the earth is curve...

An article's color fades when subjected to a chemical reaction in which oxygen is released. This oxygen combines with the natural colouring matter or with the dye to produce a colorless compound. Thus the colour of the article becomes paler and is finally taken out altog...

Christian Johan Doppler (1803-1853) was an Austrian scientist born in Salzburg who made an important discovery about the effects of sound and light when the sources are moving in relation to the observer. You may find the Doppler Effect easier to understand if you...

Water will boil anywhere, but it boils at different temperatures in different places. For example, it will boil at a lower temperature up a mountain than at sea level.

The boiling point of water is the temperature at which its vapour pressure becomes equal ...

You may not know it, buy your body is giving off heat rays. So is everything else around you. The strength of these rays, which are also known as infrared rays, depends on how warm or cold things are.

Special cameras and instruments can pick up these he...

It is possible that people will be born in space a live their whole lives there. These space people will be human beings who have left Earth to live in space colonies. The colonies will be gigantic spacecraft, man kilometers across, in which there could be whole ...

The invention wasthe parachute which was invented by the French scientist, Louis Lenormand, in 1783; His first lump was an expcrimental descent from a tree-top, suspended beneath two parasols. (The parasol is so-named because it gives...