It is hard to realize how short the period of time we have been on this planet actually is… pic.twitter.com/IyjGi3L2lA
— World and Science (@WorldAndScience) November 17, 2016
It is hard to realize how short the period of time we have been on this planet actually is… pic.twitter.com/IyjGi3L2lA
— World and Science (@WorldAndScience) November 17, 2016