Science and U: How Gravity Does Not Exist - A Neighbor's Choice

Physicist Dr. Weiping Yu returns with Science and U to talk about whether the Earth's inner core is rotating slower than surface, US Department of Energy's plan to build "next generation of fusion reactors," physicists using sound waves to give a tiny sun its own kind of gravity, and more. Visit A Neighbor's Choice website at aneighborschoice.com