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Tetrapods are vertebrate animals having four feet, legs or leglike appendages. Amphibians, reptiles, dinosaurs/birds, and mammals are all tetrapods...

Between 100,000 and 50,000 thousand years ago, something happened -- the modern human mind emerged, triggering a creative, technological, and socia...

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From the award winning science teaching series CRACKING THE CODE: The Continuing Saga of G...