HOW DO WE SPEND FREE TIME?

People have found ways of relaxing and enjoying leisure time since history began. Some of the games we still play today have ancient origins, but the media and technology boom of the 20th century brought a rush of new entertainment and pastimes, with the spread of popular newspapers, cinema, recorded music, radio, television, and computer games.

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WHAT STARTED THE AGE OF DISCOVERY?

The desire of European merchants to control the trade in luxury goods from Asia- silk, cotton, and spices- combined with the technology advances in shipbuilding and navigation led to a wave of long-distance voyages of exploration that redrew the map of the globe between the 15th and 18th centuries.

WHY IS BLOOD RED?

Blood is red because most of its cells are packed with a red-substance called haemoglobin. Using this, the red blood cells pick up vital oxygen and deliver it to the body's cells. To achieve this and other roles, such as removing waste, blood is pumped along blood vessels by the heart.

How dry is a desert?

The dry conditions in the deserts occur due to the lack of rain and snow, which is usually less than 25cm (9.8 in) in a year. The driest desert on Earth is the Atacama, Chile, where in many parts there has not been any rainfall in living memory. Hot desert are found close to the tropics, where the Sun's rays are strongest. Hot desert are freezing at night because there are no clouds to trap the Earth's heat.

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