BBC Four HD Tomorrow

The wildlife of the world's mightiest rivers, from piranhas inhabiting the wetlands downstream of Earth's tallest waterfall to crocodiles attacking wildebeest in Africa

Astrophysicists and engineers use new technologies to try and investigate the mystery of strange flying objects in the sky

David Attenborough offers an insight into the often violent lifestyles of a female-dominated colony of ring-tailed lemurs in Madagascar

Bruce Parry meets the Babongo people of Gabon and learns about their traditional coming-of-age ritual, which involves a powerful hallucinogen

Eileen Atkins looks back on her 1997 film version of Virginia Woolf's Mrs Dalloway, while describing her lifelong fascination with Woolf

A society hostess faces the ghosts of her past, stirred by the reappearance of a suitor she rebuffed 30 years earlier. Romantic drama, starring Vanessa Redgrave and Rupert Graves

A 1970 profile of the acclaimed author, examining her writing and evoking her personality through the recollections of relatives, loved ones and friends

The wildlife of the world's mightiest rivers, from piranhas inhabiting the wetlands downstream of Earth's tallest waterfall to crocodiles attacking wildebeest in Africa

Astrophysicists and engineers use new technologies to try and investigate the mystery of strange flying objects in the sky

Second of a two-part documentary following the comedian as he returns to the country of his birth and reveals the influences and motivations that helped him become 'The Big Yin'