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NHSChoices: Ankylosing spondylitis is a type of arthritis that affects parts of the spine. In this video, an expert describes the long-term effects of the condition, its most common symptoms and the different treatments available.

http://www.youtube.com/watch?v=1cYuwDkykoA

Have you ever suffered from exertional heat stroke? This condition is caused by intense activity in the heat and is one of the top three killers of athletes and soldiers in training. Douglas J. Casa explains heat stroke's tremendous effects on the human body and details an action plan in case it ever happens to someone you know.

Lesson by Douglas J. Casa, animation by Cinematic.

An army of these can attack a person 500 times in one night:



How To Get Rid of Bed Bugs - The Home Depot video: