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Why Did Mammals Survive When Dinosaurs Perished?
Had the non-avian dinosaurs not been wiped out 65 million years ago, our species would probably never existed
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Bone vs. Stone: How to Tell the Difference
There is no single hard-and-fast rule for distinguishing rock from bone, but there are a few principles that can definitely help you tell the difference
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How Sleepy Are Sloths and Other Lessons Learned
Smithsonian scientists use radio technology to track animals in an island jungle in the middle of the Panama Canal
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