EditorialNewton Howard, a cognitive scientist and machine-learning expert who hopes to help solve degenerative diseases like Parkinson’s and Alzheimer’s, wears a device that he says will use artificial intelligence to optimize and adjust the levels of deep brain stimulation, at his home in the Georgetown neighborhood of Washington, D.C., April 26, 2023. (Zak Arctander/The New York Times)
EditorialNewton Howard, a cognitive scientist and machine-learning expert who hopes to help solve degenerative diseases like Parkinson’s and Alzheimer’s, wears a device that he says will use artificial intelligence to optimize and adjust the levels of deep brain stimulation, at his home in the Georgetown neighborhood of Washington, D.C., April 26, 2023. (Zak Arctander/The New York Times)
EditorialCheryl Romaire, who has received approval from the Canadian government to end her life, wears a fentanyl patch for pain from a degenerative spinal cord condition, at her apartment in Calgary, Alberta, Aug. 22, 2022. (Ian Austen/The New York Times)
EditorialKelsie and Chris Snow at home in Calgary with their children Willa, left, and Cohen in Calgary, Alberta, Canada on Friday, April 22, 2022. (Amber Bracken/The New York Times)
EditorialFormer football player, commentator and author Tim Green, 57, at his home in Skaneateles, N.Y., on Sept. 30, 2021. (Heather Ainsworth/The New York Times)
EditorialSonia Vallabh, right, with her husband, Eric Minikel, at the Broad Institute in Cambridge, Mass., Nov. 23, 2019. (Monica Jorge/The New York Times)
EditorialTracy Semrow, whose savings have been drained by the medical costs of her degenerative connective tissue disorder, and now stays at the Alpha Project's shelter, with her dogs Yoda and Maximus, in San Diego, Calif., March 4, 2020. (Eros Hoagland/The New York Times)