It's time to open the vaults on something that many of us use every day – coins! There's some 29 billion coins in circulation, but how are they made and what engineering challenges are present in making so many shiny, tiny pieces of metal?

Hear Susanna's Safety Seymour radio ad!
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Carrots (Fruit & Root Crew)
05:13

Potatoes (Fruit & Root Crew)
05:22