From a Washington Post story by Carolyn Y. Johnson headlined “Quick-acting male birth control drug shows promise in the lab”:

In 2018, Melanie Balbach, a postdoctoral scientist at Weill Cornell Medicine, surprised her bosses with a remarkable video of mouse sperm — just sitting there.

A colleague in the lab had asked for help injecting mice with an experimental drug developed for eye disease, and Balbach agreed, with one condition. She knew that the potential eye drug targeted a molecular pathway that was crucial for male fertility. On a scientific hunch, she wanted to check what happened to normally thrashing, free-swimming sperm.