Stuff You Should Know
Consider This: Water
You probably know that Planet Earth is made up of 71% water - but did you know that only 2.5% is fresh water? And of that, less than 1% is accessible for human use? Watch the video to find out some easy ways you can make a real difference.
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Stuff You Should Know: Can Chuck Feel Josh's Pain?
People with mirror-touch synesthesia literally feel the pain of others -- but why? Tune in as Josh and Chuck explain the fascinating mechanics of mirror neurons in this exclusive video from HowStuffWorks.com and the Science Channel.
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