Masked and unmasked people make their way through Grand Central Market in Los Angeles, California on June 29, 2021 as World Health Organization (WHO) urges fully vaccinated people to continue wearing masks with the rapid spread of the Delta variant. Frederic J. Brown/AFP via Getty Images hide caption
A paramedic with Falck Northwest ambulances treats a man experiencing heat exposure during a heat wave in Salem, Ore. Nathan Howard/AP hide caption
An artistic image of what happens when a monstrous black hole collides with — and gulps down — a neutron star the size of a large city. Carl Knox/OzGrav/Swinburne hide caption
The process for investigating the Champlain Towers South collapse will involve trying to reconstruct parts of the building and look for how the critical pieces failed, structural engineering consultant John Pistorino says. Joe Raedle/Getty Images hide caption
Timothy Dominique, 62, lives in a donated RV parked next door to the family home where he was staying when Hurricane Laura hit Lake Charles last year. He says he received nothing from FEMA because he does not own the home and didn't have a formal rental agreement. Ryan Kellman/NPR hide caption
A computer-enhanced image of the HIV virus. Callista Images/Getty Images/Image Source hide caption
