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 DO MOUNTAINS GROW?

Where the plates of Earth's crust crash into each other, land is pushed upward, forming mountains. The Himalayas are the tallest mountains on Earth, and the youngest. They formed over the last 145 millions years, as India crashed into Asia. Mountains are also formed when volcanoes erupt and molten rock builds up into steep mounds.

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