Paleontologists with the University of Washington’s Burke Museum of Natural History and Culture have made a major discovery. Recently, they have found a 66.3-million-year old Tyrannosaurus rex skull.
Is that giant T-rex fossil you saw at the museum a boy or a girl? Even for paleontologists who devote their lives to studying dinosaur fossils, it’s a tough call, because the bones themselves rarely give away a dinosaur’s sex.