Water will boil anywhere, but it boils at different temperatures in different places. For example, it will boil at a lower temperatures up a mountain that at sea level. The boiling point of water is the temperature at which its vapour pressure becomes equal to the outside atmospheric pressure. As the atmospheric pressure is always changing so the boiling point …

In the beginning our universe was a mass of white-hot vapours and molten materials whirling about in space. Our world was formed from this. Astronomers believe it took millions of years for the cloud to cool, contract and begin to turn into molten rock. Modern astronomers think that many millions of years ago there was a huge explosion in space. …

Kelly Brownell — Kelly D. Brownell is an American scientist, professor, and internationally renowned expert on obesity. Brownell is Director of the Rudd Center for Food Policy and Obesity at Yale, where he is also Professor of Psychology and Professor of Epidemiology and Public Health. His research deals primarily with obesity and the intersection of behavior, environment, and health with …

The first zoo was formed in China in the 12th century B.C. But it was not called a zoo. Wen, the ancient Chinese king who started it, wanted to collect different types of animals from all over his empire. He kept them in what he called a ‘garden of intelligence’, near his palace. Some of the largest zoos are in …

Keisuke Honda is an indispensable member of Takeshi Okada’s team. A prolific midfielder who will turn 24 the day before Japan kick-off their South Africa 2010 campaign, he dazzled for CSKA Moscow in the deep waters of the 2009/10 UEFA Champions League, playing a critical role in their unforeseen charge to the quarter-finals. Honda started out at Nagoya Grampus, scoring …

The center of gravity of an object is a point at which all its weight can be considered to be located. This point is usually inside the object. However, your center of gravity may be inside or outside your body, depending on whether you’re standing, sitting, bending or falling over. If your center of gravity is over your feet, then …

We listen to weather forecasts to find out how warm and sunny, wet or windy the weather is likely to be. People in eastern Sahara, in North Africa, don’t have this problem. This is the world’s sunniest place, with an average of over 4,300 hours of sunshine a year-nearly 12 hours a day!

Kazuo Ishiguro — Kazuo Ishiguro is a Japan-born British novelist. Originally from Nagasaki, his family moved to England in 1960. Ishiguro obtained his Bachelor’s degree from University of Kent in 1978 and his Master’s from the University of East Anglia’s creative writing course in 1980. He won the Whitbread Prize in 1986 for his second novel An Artist of the …

Deltas are plains near the mouths of some rivers, made of sediment dumped there by the rivers. The world’s largest delta is the Ganges-Brahmaputra delta, which lies partly in Bangladesh and partly in India. This low-lying fertile plain is one of the world’s most densely populated areas. It has also been the scene of many disasters when storms in the …

Many deserts-places, which have less than 25cm (10in) rainfall a year-are, in fact, dry for years and then a freak storm causes floods. Or heavy rains can transform some deserts, as in Namaqualand, South Africa, into a sea of flowers, bringing new life to seeds, which may have been dormant for years. Elsewhere, drought-resistant plants like cacti soak up rainwater …