The 225-million-year-old fossil that changes everything we know about dinosaurs

A remarkable fossil unearthed in Africa is rewriting the story of dinosaur origins. The 225-million-year-old leg bone, belonging to a little-known group of reptiles called silesaurs, challenges long-held beliefs about the size of the very first dinosaurs — or their closest ancestors. The breakthrough find hints that early dinosaurs may have been far larger than previously imagined, opening a new…