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.
Mysteries of Science is a fortnightly podcast created by The Week Junior's Science+Nature magazine and Fun Kids.
Tap follow or subscribe wherever you're listening to this to make sure you never miss an episode.
Get three copies of The Week Junior's Science+Nature magazine for just £5. sciencenature.theweekjunior.co.uk/podcast is the place to claim yours.
See omnystudio.com/listener for privacy information.