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Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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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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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero This image shows an artists depiction of a 10-kilometer (six-mile) diameter astero
Hand mnemonic for the basic atmosphere composition being 4/5 nitrogen and 1/5 oxygen. Hand mnemonic for the basic atmosphere composition being 4/5 nitrogen and 1/5 oxygen.
The geomagnetic polarity time scale shows how Earth’s magnetic pole has changed through geologic tim The geomagnetic polarity time scale shows how Earth’s magnetic pole has changed through geologic tim
This map shows the percentage of Protestants by state in Germany. When compared to the previous map This map shows the percentage of Protestants by state in Germany. When compared to the previous map
This illustration shows the decibel level in various locations and associated with different ... This illustration shows the decibel level in various locations and associated with different ...
Notice the reddish-brown haze caused by nitrogen oxides that is often over many major cities. Notice the reddish-brown haze caused by nitrogen oxides that is often over many major cities.
Video: Energy Flow - Trophic Levels and Food

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