altitude sickness

WEDNESDAY WONDER: WTF is "altitude sickness" and how I almost died in Colorado

Have you ever seen cans of Oxygen for sale? I thought it was weird too. Little did I know that that little can would help save my LIFE!! Obviously we need oxygen to live...otherwise we end up seeing something like this: ID 41855645 © Hongqi Zhang (aka Michael Zhang) | Dreamstime.com Doesn't that...
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