Science Building a fire in a cave is not easy — early humans figured out how 4:40pm February 04, 2022 Research News Science History Share URL copied to clipboard! Copyright 2022 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered National You can sword-fight at this club. But no politics allowed Arts National In 'Wicked: Part I', Cynthia Erivo defies gravity — and convention — as Elphaba 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate