The year is 1923. Roy Chapman Andrews leads an expedition in the Gobi desert that finds fossils that shake the paleontologic world. What I read about in my elementary school days in the mid 1970's - that these fossils were Protoceratops - was amended in 1995 - they'd actually been looking at Oviraptors (a misnomer). In any event, though they had the species wrong, the contribution to dinosaur knowledge was enormous. Andrews et. al. with these misidentified little fossils, proved what?
dinosaurs came from eggs