Science Health & Safety Q&A: What's Different About The Delta Variant 5:13pm July 31, 2021 by Joe Palca Science Health Share URL copied to clipboard! Copyright 2021 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered Politics & Government California Rep. Adam Schiff calls for Biden to step aside Arts Apex the Stegosaurus sells on auction for record $44.6 million 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate