11:20 PM - 12:20 AM
Secrets of Size: Atoms to Supergalaxies - S1 Ep1
1/2. In this mind-bending film, Jim Al-Khalili explores the universe at its smallest, from tiny insects to living cells and viruses, before finally arriving at the atom. [S] [HD]
12:20 AM - 12:50 AM
Secrets of Skin - S1 Ep4
4/6. Professor Ben Garrod explores how skin has evolved remarkable ways to enable animals to communicate with each other, from vibrant displays of colour to skin pouches to amplify sound. [S] [HD]
12:50 AM - 01:20 AM
Weatherman Walking
1/2. Derek Brockway walks in Dylan Thomas's footsteps around Swansea before heading to the Llansteffan Peninsula and the Three Rivers estuary. [S] [HD]
01:20 AM - 02:20 AM
The Normans - S1 Ep3
3/3. Professor Robert Bartlett explores the impact of the Normans on southern Europe and the Middle East, as they spread south in the 11th century. [S,AD,SL]
02:20 AM - 03:20 AM
Secrets of Size: Atoms to Supergalaxies - S1 Ep1
1/2. In this mind-bending film, Jim Al-Khalili explores the universe at its smallest, from tiny insects to living cells and viruses, before finally arriving at the atom. [S,SL] [HD]
03:20 AM - 05:30 AM
This is BBC Four
Programmes start at 7.00pm. [HD]
05:30 AM - 11:30 AM
..programmes start at 7.00pm
11:30 AM - 05:30 PM
..programmes start at 7.00pm
05:30 PM - 06:58 PM
..programmes start at 7.00pm
06:58 PM - 07:00 PM
This is BBC Four
Programmes start at 7.00pm. [HD]
07:00 PM - 07:30 PM
Secrets of Skin - S1 Ep5
5/6. What is the most toxic animal on earth? Why is a rhino armour plated? Professor Ben Garrod discovers the complex ways in which skin helps defend animals against threats of all kinds. [S] [HD]
07:30 PM - 08:00 PM
Weatherman Walking
2/2. Derek Brockway learns how New Quay on Cardigan Bay inspired some of Thomas's greatest work, before touring Laugharne with Dylan Thomas's granddaughter. [S] [HD]
08:00 PM - 08:50 PM
What Are UFOs?
After years in the shadows, UFOs are being studied seriously. Follow scientists as they try to unravel the mystery of the strangest objects in our skies. [S,AD] [HD]
08:50 PM - 09:00 PM
Building Sights - S3 Ep1
Architect Sir Norman Foster looks at the jumbo jet, a unique 'building' that flies. First broadcast in 1991. [S]
09:00 PM - 10:30 PM
Television's Opening Night: How the Box Was Born
An attempt to restage the first official broadcast on British television 80 years later. [S,AD] [HD]
10:30 PM - 11:45 PM
The Fools on the Hill
Dramatisation of the events of 1936, as the BBC prepares for the world's first high-definition TV service. However, behind the scenes at Alexandra Palace complications arise. [S] [HD]
11:45 PM - 12:05 AM
Television Comes to London
A short film from 1936 that gives viewers an insight into how television came to Alexandra Palace. [S]