TV Guide for Tomorrow Wednesday 27 in BBC Four

Semi-final of the quiz show in which patience and lateral thinking are as vital as knowledge, and connections need to be made between apparently unconnected things.

Wildlife expert Liz Bonnin, actor Freida Pinto and mountaineer Jon Gupta reveal the hidden wonders of India's surprising natural world.

Two of the four highest-scoring losing teams from the first round play for one of the two spots remaining in round two. Jeremy Paxman asks the questions.

Final of the quiz show with Victoria Coren in which patience and lateral thinking are as vital as knowledge, and connections need to be made between apparently unconnected things.

Dr Helen Czerski explores the science of heat and how it has shaped the modern world.

Documentary looking at the first murder on Britain's railways. On a Hackney bound train in 1864, a guard discovers blood in a first-class carriage and a body on the embankment.

Stephen finds an enemy and then a friend when he tries to help the appropriately named Professor Furie overcome his tiredness. Contains adult humour.

The medical staff must write academic research papers. Bob seizes the opportunity to trial a tranquiliser that might kick off his career as a private consultant. Contains adult humour.

To mark 100 years of romance publishers Mills and Boon, literary novelist Stella Duffy takes on the challenge of writing for them, a task that ends up being harder than it looks.

Final of the quiz show with Victoria Coren in which patience and lateral thinking are as vital as knowledge, and connections need to be made between apparently unconnected things.

Documentary looking at the first murder on Britain's railways. On a Hackney bound train in 1864, a guard discovers blood in a first-class carriage and a body on the embankment.