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A look back over the highs and lows experienced by the hundreds of entrepreneurs who have entered the Den over the last nine series, examining the key ingredients required for a successful pitch.
Wallace & Gromit's World of Invention
Heated
Modern Marvels
James May's 20th Century
History's Greatest Machines with Dolph Lundgren
Faster! Humanity's Quest to Save Time
David Jason's Great British Inventions
The Secret Life of Machines
The Genius of Invention
RISING
Histoire des Inventions
Help! I Bought It at Auction with Sarah Beeny
The Mega-Brands That Built America
The Game Plan with Shaquille O'Neal
The Big Life Fix
Inventions That Shook the World
Japan's Top Inventions
Ancient Inventions
