Horizon Season 21 Episodes

Episode 2

Contented Cows and Other Animals

Episode 3

Picking Winners

This programme is comprised of a three-part studio-based discussion with some of Britain's leading scientists and filmed inserts, featuring specially-shot footage and interviews, together with BBC archive and copyright footage.

Episode 4

The Brain Puzzle

Episode 5

Global Village

Episode 6

Ivan

Portrait of Ivan Vaughan, who suffers from Parkinson's disease, and his efforts to cope with his illness.

Episode 7

A Mathematical Mystery Tour

49 mins

A look at the some of the most famous mathematical problems yet to be solved, such as Fermat's Last Theorem and the Riemann Hypothesis.

Episode 8

Supercharged

A look at Grand Prix motor racing cars between 1924 and 1939.

Episode 9

Colourful Notions

Episode 10

A World of Their Own

Episode 11

Decoding Danebury

Episode 12

A Mission to Heal

Episode 13

Mystery of the Left Hand

Episode 14

The Theatre of War

Episode 15

The Careful Predator

Episode 16

What Einstein Never Knew

Episode 17

Eurekaaargh!

Episode 18

Careering On

Episode 19

How to Film the Impossible

Episode 20

The Food Allergy War

Episode 21

The Goddess of the Earth

Episode 22

IRAS: The Supercooled Eye

Episode 23

A Prize Discovery

Episode 24

The Hunt for the Legion Killer (Update)