A remarkable new discovery is shedding light on one of the greatest survival stories in Earth’s history—and answering a decades-old scientific mystery. Lystrosaurus, a hardy, plant-eating mammal ancestor, rose to prominence following a mass extinction some 252 million years ago—the most devastating extinction event our planet has ever experienced. While countless species vanished, Lystrosaurus not […] The post Embryo Fossil is Missing Puzzle Piece Thrilling Scientists with Oldest Proof that Mammal Ancestors Laid Eggs appeared first on Good News Network.