EditorialJose Echevarria, who has Huntington’s disease, a hereditary, progressive neurodegenerative illness caused by a genetic mutation, at the home he shares with his mother and sister in Piojo, Colombia, May 8, 2023. (Charlie Cordero/The New York Times)
EditorialDr. John Q. Trojanowski in his lab at the University of Pennsylvania in Philadelphia, June 10, 2010. (Sabina Louise Pierce/The New York Times)