5. Olivia Hallisley, 18

hair, face, person, nose, blond,

This brilliant teen is helping make the world healthy again. She discovered a treatment for Ebola that doesn’t require refrigeration—much more effective for victims of the virus in rural Africa. Her accomplishments didn’t go unnoticed; Olivia was recognized in the 2015 Google Science Fair.

Katie Ledecky, 19
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