Why would scientists plumb a mile beneath the South Pole in search of clues to a riddle of cosmic proportions? To find out, tune into Perpetual Notion Machine’s conversation with Dr. Justin Vandenbroucke of UW-Madison about the strange high-energy subatomic particles known as neutrinos. Vandenbroucke is part of a team that recently observed the first evidence of the source of neutrinos, which freely pass through all known matter in the universe, including stars and planets.