The Earth and Its Elements

20 February 2009
Presented by Chris Smith.

EARTH

"The Blue Marble" is a famous photograph of the Earth taken on December 7, 1972, by the crew of the Apollo 17 spacecraft en route to the Moon at a distance of about 29,000 kilometres (18,000 mi). It shows Africa, Antarctica, and the Arabian Peninsula.

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How does the Earth rotate? Why do we not fall off the Earth as it spins? Why is there a periodic table? Why is Oxygen written as O2? We tackle these questions in this week's show. We also find out about the causes and symptoms of diabetes, investigate how our bodies generate heat, and reveal how to create a perfectly straight object!

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