John Grunsfeld, an astronomer and astronaut, says that fixing the Hubble Space Telescope was be a delicate operation. In this podcast, he explains how astronauts had to literally let their fingers do the walking when working on satellite-and why the gloves of their space suits played a major role in the mission's success. Podcast produced by David Levin. Interview by Rush DeNooyer. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. To learn more, visit us online at pbs.org/nova/hubble