The 10 Million Challenge, 2014 hosted by Alice Roberts.
To celebrate its 50th birthday, Horizon invites the public to play a role in tackling the greatest challenges facing science today.
This special episode of Horizon launches the £10 million Longitude Prize 2014 - a prize developed by Nesta, with Technology Strategy Board as funding partner, to find solutions to a new scientific challenge.
The Longitude Prize 2014 commemorates the 300th anniversary of the original Longitude prize - a £20,000 reward for finding a way to determine longitude at sea accurately. The prize was overseen by the Board of Longitude, comprising the scientific, political and naval leaders of the day.
