Rethinking the mystery of gravity

What would you think if someone said gravity might not exist as a fundamental force? Prof. Janna Levin explored that mind-bending topic on a recent podcast and breaks down what that means to NBC’s Gadi Schwartz. » Subscribe to NBC News: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! Breaking News Alerts: Visit : Find NBC News on Facebook: Follow NBC News on Twitter: