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How can you determine the weight of the planet you stand on?
BySDTodayIt turned out to be far closer to America than many ever thought.
BySDTodayIt may still be possible to understand what happened, even when our science reaches its limit.
BySDTodayAll the biggest science news stories of the week.
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Perhaps we’re wrong about the date of the catastrophe.
BySDTodayMing lived to be 507 years old, surviving the Reformation, the Enlightenment, and the entire run of Seinfeld.
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