Season 5 Episodes20
Cast2

Rupert Degas

Robert Llewellyn
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Ranked #6 of 20 in Season 5•+0.2 vs season avg
The world's strongest knives; growing diamonds in a laboratory; producing enough bricks to build the modern world.

Rupert Degas

Robert Llewellyn
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"World's Strongest Knife, Diamonds, Bricks" is episode 2 of How Do They Do It? season 5. It scored 7.5/10 from 11 votes, ranking #6 of 20 episodes this season (season average 7.3). It aired on March 4, 2008.