Science in Action is a long-running weekly radio programme produced by the BBC World Service and currently hosted by British journalist Jon Stewart. Stewart spent five years at BBC Radio 1 before taking over the presentation of Science in Action. It is broadcast on Thursdays at 18.32 GMT and repeated twice the following day, at 01.32 and 08.32.
A programme with the title Science in Action is believed to have begun life in 1964, when it replaced an earlier series, dating from the 1950s, called Science and Industry. From September 1965 a short-lived series called Science in Action ran on the Home Service; it was broadcast at 19.30 on Thursdays, later 21.30. In December 1965 it was moved to 14.30 on Fridays. The present weekly World Service series, also called Science in Action, began on Saturday 7 July 1979.