Research scientist Jessica Medrado, who became the lead engineer for a project to create a sea salt aerosol spraying device two years ago, on the flight deck of the Hornet, a decommissioned aircraft carrier that is now a museum in Alameda, Calif., on March 28, 2024. By the end of last year, the sprayer had been assembled and was waiting in a warehouse near San Francisco. (Ian C. Bates/The New York Times)