The 2015 Nobel prize for physics was awarded last week for their discovery that neutrinos not only have mass, but they can also change identities on the fly. Dr. Kakalios, physics professor at the University of Minnesota and author of "The Amazing Story of Quantum Mechanics" explains how and why the discovery is so remarkable.

"A Beautiful World" is a news program produced by American Public Media that focuses on inspirational stories from around the world, featuring good news about science, technology, ecology, art, music and medicine. The program is hosted by best-selling author Heather McElhatton. Visit www.mpr.org/abeautifulworld for more stories and audio collections.

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