A frame of a video generated by the original iteration of Sora, an artificial intelligence tool from OpenAI.

President Trump speaking to reporters this week. He has reveled in a threat to target what he called “Democrat Agencies” for temporary and permanent cuts.

At least half of the eight new members of a C.D.C. panel, who are meeting for the first time on Wednesday, have expressed some skepticism about vaccines.

A campaign debate among Canada’s party leaders in Montreal last week. Online content around the April 28 federal election has veered into misinformation.

The fabricated video of Matthew Miller, the State Department spokesman, had telltale clues of manipulation. The lip sync was off, and Mr. Miller’s shirt and tie changed color midway through.

Heavy clouds descended over Oakland and San Francisco as an atmospheric river approached the Bay Area.

Deborah Sebi, right, a nurse at a mobile clinic in Teshie, a fishing village in Ghana, prepared an immunization for Rebecca Bamembaye’s 3-month-old, Doris.