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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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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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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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