LifeFirst dinosaurs may have been omnivores in the north hemisphere Largest shake-up of dinosaur family tree in 130 years puts T. rex in a group with herbivores and uproots what we thought we knew about the reptiles 51动漫
EarthTraces in rock may be the oldest evidence of life on Earth ever Rocks that could be just 200 million years younger than Earth carry structures and signatures reminiscent of microbial activity, but some dispute that view 51动漫