Stuff You Should Know
Consider This: Biodiversity
Some scientists feel like a lack of biodiversity could be the planet's most daunting issue in the future. When species become extinct, it sets off a chain reaction affecting the entire ecosystem. Learn about the biodiversity issues facing our planet.
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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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