The story of leptin is told on the BBC Science programme Horizon.

BBC: Born to be fat

It is a region that Curiosity project scientist John Grotzinger told the BBC's Horizon programme reads like a "book about the early environmental history of Mars".

BBC: Nasa's Curiosity rover successfully lands on Mars

Longitude - A Horizon special - is broadcast on BBC Two on 4 January, 1999, at 2130 GMT.

BBC: Time to make history

Horizon: Mission to Mars was broadcast on BBC Two Monday 30 July.

BBC: Gale Crater: Geological 'sweet shop' awaits Mars rover