National Science Health & Safety Scientists May Have Found A Marker Of How Effective COVID-19 Vaccines Are 4:40pm August 10, 2021 by Joe Palca Science Health Medical Treatments National Share URL copied to clipboard! Copyright 2021 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered Sports Where does the U.S. Men's Soccer team go after Gregg Berhalter's firing? Arts 'Wild Card': Poet Nikki Giovanni says she doesn't dwell on accolades by Rachel Martin 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate