In the 1950's, a particle physicist made a landmark discovery that changed what was known about how the universe operates. Chien-Shiung Wu did it while raising a family and an ocean away from her relatives in China. Short Wave's Scientist-In-Residence Regina Barber joins host Emily Kwong to talk about that landmark discovery—what it meant for the physics world, and what it means to Regina personally as a woman and a Chinese and Mexican American in physics. Email the show at shortwave@npr.org.