Science Scientists are a step closer to defining when the age of humans officially began 5:06am July 13, 2023 by Rebecca Hersher Share URL copied to clipboard! Copyright 2023 NPR. To see more, visit https://www.npr.org. 300x250 Ad More Morning Edition National Gunman who killed 23 at an El Paso Walmart pleads guilty, sentenced to life in prison National Sen. Jack Reed calls for investigation into Pete Hegseth's Signal chat by Leila Fadel 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate