Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Conventional color wheel
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The X-linked genetic model of Morgan’s eye-color inheritance
