Maggie Gyllenhaal and Morgan Freeman have teamed up to conquer the world's greatest mysteries on a new U.S. TV show.
The Dark Knight co-stars have signed up to host an episode of Curiosity, a new Discovery Channel series which aims to answer life's most challenging questions about science and technology.
A number of other celebrities have also signed up to narrate episodes: Robin Williams will tackle drug myths; Samuel L. Jackson will ponder the end of the world, and Avatar's Michelle Rodriguez will reflect on whether the human race could fend off an alien invasion.
Gyllenhaal will question why sex is fun and Freeman will explore alternative universes.
The series premiere, which will be hosted by famous physicist Stephen Hawking, is set to air in America on Sunday (07Aug11).