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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?

<p>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?</p>

We're the UK's children's radio station. Listen across the UK on DAB Digital Radio, on mobile and online at funkidslive.com.

<p>We're the UK's children's radio station. Listen across the UK on DAB Digital Radio, on mobile and online at funkidslive.com.</p>

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