Are There Aliens Among Us?
Microscopic tardigrades, or “water bears,” are the only animals that can withstand the extreme temperatures and conditions found in the vacuum of outer space. This raises the question: Did they evolve on Earth or migrate here from elsewhere in the universe? H/T ViceARVE Error: need id and provider
Hank Green, the host of the SciShow, calls tardigrades “the toughest animal on the planet,” and explains why NASA and the European Space Agency have fallen in love with these extremophiles.ARVE Error: need id and provider