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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Cyanide works by making the human body unable to use oxygen.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.