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Did you know?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Thyroid conditions may make getting pregnant impossible.

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Video: The pH scale - Strong acids and Weak acids

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