Fossil tracks from 545 million years ago suggest complex life forms were already crawling around before the Cambrian ...

Thylacine De-Extinction Achieves Mid-Gestation Marsupial Embryo Development In Artificial Uterus “This will enable us to generate thylacine young at scale for rewilding, without the need for ...

Editor's Note: This story was updated on Friday, Dec. 22 at 4:15 p.m. E.D.T. to correct the timing of the first mass extinction. It occurred 20 million, not 20, years after the Cambrian explosion.