Why it's cold on airplanes
 

http://img-s-msn-com.akamaized.net/t...f&x=1779&y=179When you get on an flight, most airlines allow you to have one carry-on bag and one personal item. But it turns out there?s a medical reason why the cabin temperature is kept so low. A study from the American Society for Testing and Materials looked into the correlation of in-flight fainting and cabin pressure and temperature. Hypoxia occurs when body tissue does not receive enough oxygen. And since everyone?s body temperatures are slightly different, airlines err on the side of safety and keep the temperature extra low.

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