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Thyroid conditions may make getting pregnant impossible.

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

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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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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

The calcaneus spur found on the male's hind limb is used to deliver venom. The calcaneus spur found on the male's hind limb is used to deliver venom.
Pacific hagfish at 150 meters depth, California, Cordell Bank National Marine Sanctuary. Pacific hagfish at 150 meters depth, California, Cordell Bank National Marine Sanctuary.
The World’s Muddiest River The World’s Muddiest River
In 2007 acclaimed filmmaker Ken Burns released a documentary on World War II that triggered an angry ... In 2007 acclaimed filmmaker Ken Burns released a documentary on World War II that triggered an angry ...
From this 1946 photo, you can see how computers have changed. This is the ENIAC, the world’s first ... From this 1946 photo, you can see how computers have changed. This is the ENIAC, the world’s first ...
The upper waters of the oceans flow horizontally in currents The upper waters of the oceans flow horizontally in currents
Video: How eudicots (true dicots) differ from monocots Animation

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