292 TMD How to Think About the Size of the Ea...
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As far as weight goes, Earth is a pretty hefty celestial body. But exactly how heavy? And how does one measure something so massive? Find out in this podcast from HowStuffWorks.com.
How do individuals relate to reality? How has humanity attempted to interpret its position in the universe? From navel-gazing to the geocentric universe and beyond, the search for humanity's place has become a long -- and mind-blowing -- enterprise.