In the 1950's the US Navy conducted a secret biological warfare experiment on the people of San Francisco Bay where they sprayed harmful bacteria into the air in order to determine how vulnerable a city like that may be to a bioweapon attack.

Fast forward now to 2024 where scientists from the University of Washington gathered on the deck of a decommissioned aircraft carrier in San Francisco Bay to conduct an experiment that was intentionally kept under the radar to minimize public backlash, the team started up a high-powered spraying machine and shot microscopic salt aerosol particles hundreds of feet into air! The trial, meant to test how well these aerosols could travel outside of the lab, is a basis for a much grander future experiment: using the particles to artificially brighten clouds.