We're always chatting to clever people on Mysteries of Science but not all of their interviews make the cut; sadly, sometimes we have to chop bits out!

We're looking back at our favourite mysteries of 2021 and we're playing some never-before-heard, extra-special clips from some of our favourite episodes...

We'll be back in the new year with more Mysteries of Science, including episodes on alien communication and archeological discoveries.

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2021 Year in Review: Unheard bits from past Mysteries