There are 60,000 miles of blood vessels in every adult human.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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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.
The effects of elevated atmospheric CO2 on insect herbivores.
Tiny insect
Plants
Plants
The Major Divisions of the Peripheral Nervous System