Supporters of single-payer health care march to the California capitol in 2017. On Monday, the author of a universal health care bill in the legislature didn't bring the measure up for a vote on the final day it couldn't be considered because he didn't think it would pass. Rich Pedroncelli/AP file photo hide caption
Sandra Castro vaccinates first-grader Kristen Cruz, 6, at KIPP Believe Charter School in New Orleans last week ahead of Tuesday's deadline for all students in the city's school system to be vaccinated. Ted Jackson/AP hide caption
Protesters show their support for the "Freedom Convoy" of truck drivers who were making their way to Ottawa to protest COVID-19 vaccine mandates by the Canadian government Thursday. Arthur Mola/Invision/AP hide caption
Spotify says it will add a content advisory to podcasts that discuss COVID-19. Martin Bureau/AFP via Getty Images hide caption
Microglia, specialized cells like the one seen in the center of this image, can restrain the accumulation of beta-amyloid protein (plaques in orange) that are a hallmark of Alzheimer's disease. But the cells sometimes contribute to the progression of the illness, researchers say. Juan Gaertner/Science Source hide caption
Gabrielle Union. Photo illustration by Renee Klahr/NPR hide caption
People walk beside trucks parked along Wellington Street in Ottawa, Canada, during a rally against COVID-19 restrictions on Saturday. Justin Tang/The Canadian Press via AP hide caption
TK Will Stone/NPR hide caption
Shown above are rapid at-home COVID-19 test kits ready to be distributed by the GreenRoots environmental protection organization and Chelsea Community Connections in Chelsea, Massachusetts. JOSEPH PREZIOSO/AFP via Getty Images hide caption
A Hong Kong hamster that evaded the cull. Bertha Wang/AFP via Getty Images hide caption
A scene from Midwives: A baby whose face is adorned with thanaka — a kind of sunscreen made from wood bark. POV/EyeSteelFilm hide caption
Julio Francisco waits for people to show up wanting a COVID-19 test on January 13, 2022 in Miami, Florida. Joe Raedle/Getty Images hide caption
A sign in a hallway at a Chicago elementary school reinforces the mantra of social distancing. Scott Olson/Getty Images hide caption