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Green tea is able to stop the scent of garlic or onion from causing bad breath.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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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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Vaccines prevent between 2.5 and 4 million deaths every year.

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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).

The Kingsley plantation, on Fort George Island in Jacksonville, Florida. Zephaniah Kingsley, the own The Kingsley plantation, on Fort George Island in Jacksonville, Florida. Zephaniah Kingsley, the own
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Video: The Pressure Flow Model in a Plant

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