- New Tyrannosaurus rex study shows 20,000 lived at any one time, or 2.5 billion in total (although the study's 95% confidence interval means the number could have been anywhere from 140 million to 42 billion). https://www.psychnewsdaily.com/new-tyrannosaurus-rex-study-shows-20k-lived-at-any-one-time-or-2-5-billion-in-total/ 13 comments science
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