Conventional scientists have been baffled for many years by the small arms of Tyrannosaurus rex. To many, they just seem disproportionately small compared to other theropod dinosaur arms. The question is often asked: What use could these tiny arms be for such a large predator? A recent study claims to have solved this enduring enigma.1 And yet, a simple visit to a playground teeter-totter would have likely saved them a lot…
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