Science Health & Safety Understanding Where Coronaviruses Come From And How They Enter Humans 5:32am March 19, 2021 by Michaeleen Doucleff Science Health Share URL copied to clipboard! Copyright 2021 NPR. To see more, visit https://www.npr.org. 300x250 Ad More Morning Edition National Multiple probes examine security failures that led to Trump assassination attempt World News What does the international community make of Trump's 2024 America first policy? 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate