Orang-utan. The world's largest tree-dwelling animals.
Living for Ever. The series concludes with a look at the ageing process and a potential elixir of youth that promises to double a healthy life span. The Genetics Debate is tomorrow, 7.10pm.
With George Alagiah.
Christopher Hitchens's portrait of the US president.
An examination of the life and work of innovative Indian sitar player Ravi Shankar, who has worked with Yehudi Menuhin and John Coltrane, and taught George Harrison. Features footage from 1954 to the present and interviews with Shankar.
Documentary recounting the life of Brigid Berlin, daughter of the chairman of the Hearst Corporation, who achieved cult status after appearing nude in photographs and Andy Warhol films.
The director talks about the rituals of writing and speaks of his attitudes to religion and death in the conclusion of the two-part interview.
