BBC Four Wednesday

Ben Garrod explores how animals' skin acts as a barrier between them and the outside world, shielding them from extremes of temperature, harmful effects of UV and organisms

In the Brecon Beacons, Gareth and wife Maureen enlist in tank school and get tips on clay pigeon shooting and photography

Exploring Emperor Augustus's Alpine campaign, revealing the route, weapons and tactics used by the Romans to successfully annex the unconquered Alps

Architect Sand Helsel applauds Trellick Tower, a brutalist tower block in west London, designed by Erno Goldfinger and completed in 1972

Professor Brian Cox examines Jupiter, the largest and oldest planet in the solar system, revealing how its immense gravity influenced where other planets developed

Marlow sees the mysterious men from the detective story on the ward, while another session with Dr Gibbon leads him to recall a disturbing incident with his mother

Philip's various fictions and memories merge together - much to the anger of the characters, who seek retribution on their creator

An investigation into the Gunpowder Plot of 1605, exploring how a group of Catholic Englishmen became so radicalised they attempted to destroy Parliament

Ben Garrod explores how animals' skin acts as a barrier between them and the outside world, shielding them from extremes of temperature, harmful effects of UV and organisms

In the Brecon Beacons, Gareth and wife Maureen enlist in tank school and get tips on clay pigeon shooting and photography

Professor Brian Cox examines Jupiter, the largest and oldest planet in the solar system, revealing how its immense gravity influenced where other planets developed