In this April 12, 2019, photo, Washington Redskins head athletic trainer Larry Hess demonstrates a salt water float orb inside a recovery room at the team's NFL football training facility in Ashburn, Va. (AP Photo/Patrick Semansky)

In this October 9, 2018, photo, Qin Jinzhou, an embryologist, moves a microplate containing embryos that have been edited in a laboratory in China.

This microscopy image provided by Dr. Carl June shows immune system T-cells (C) binding to beads that cause the cells to divide, then are later removed to leave pure T-cells, which are then ready for infusion to leukemia patients, August 2011.