Beads treated to react to ultraviolet light are used to show how the Sun's invisible rays can effect us at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)
Beads treated to react to ultraviolet light are used to show how the Sun's invisible rays can effect us at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)