Mark Rober's CrunchLabs

S04E01 Moving Train Jump Test

Mark pushes the boundaries of science by tackling a series of brain-teasing challenges in the most extreme settings imaginable. He balances atop a speeding train to test his theories, then ascends into the sky in a hot air balloon to gather data from the clouds. With each daring experiment, he proves that curiosity knows no limits—and that the answers to life's greatest questions often lie just beyond your comfort zone.