On April 25, 1953, James Watson and Francis Crick published their groundbreaking discovery of the double helix structure of DNA, the molecule essential for passing on our genes and the ''secret of life'.' But their crucial breakthrough depended on the pioneering work of another biologistÐRosalind Franklin. She would never know that Watson and Crick had seen a crucial piece of her data without her permission. This was an X-ray image, ''Photo 51',' that proved to be a vital clue in their decoding of the double helix.

NOVA Season 30 Episodes...

• s30e01 - Killer Disease On Campus
• s30e02 - Mysterious Life Of Caves
• s30e03 - Lost Roman Treasure
• s30e04 - Galileo's Battle For The Heavens
• s30e05 - Volcano's Deadly Warning
• s30e06 - Sinking City Of Venice
• s30e07 - The Orchid Hunter
• s30e08 - Spies That Fly
• s30e09 - Last Flight Of Bomber 31
• s30e10 - Ancient Creature Of The Deep
• s30e11 - Battle Of The X-Planes
• s30e12 - Mountain Of Ice
• s30e13 - Lost Treasures Of Tibet
• s30e14 - Dirty Bomb
• s30e15 - Deep Sea Invasion
• s30e16 - Secret Of Photo 51

NOVA Show Summary

Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.