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The C.D.C. will recommend that some vaccinated people wear masks indoors again.

New York City and California will require workers to be vaccinated or face testing.

Russia topped the United States for gold after Simone Biles’s stunning withdrawal.

As Virus Cases Rise, Another Contagion Spreads Among the Vaccinated: Anger

Jill Biden, Changing the Fashion Game

Rep. Clay Higgins, a staunch opponent of mask mandates, announces he and his family have Covid-19.

Russia Is Banned, Yet It’s Everywhere at the Games

As China Boomed, It Didn’t Take Climate Change Into Account. Now It Must.

V.A. Issues Vaccine Mandate for Health Care Workers, a First for a Federal Agency

At the F.D.A.’s urging, Pfizer-BioNTech and Moderna are expanding their trials for children 5 to 11.

QR Codes Are Here to Stay. So Is the Tracking They Allow.

Katie Ledecky Feels the Sting of a First Olympic Loss

New York City and California will require workers to be vaccinated or face testing.

Return to Office Hits a Snag: Young Resisters

Mr. President, You’re Just Plain Wrong on Voter Suppression

Toyota Led on Clean Cars. Now Critics Say It Works to Delay Them.

8 Are Killed as Sandstorm in Utah Causes a Highway Pileup

After Covid Diagnosis, a Conservative Radio Host Sends a New Message

5 Dead in Hamptons Crash That Is Blamed on Speeding