We're finishing the second season of Mysteries of Science by looking at some of your mysteries. From unicorns to black holes and even the Big Bang, we're looking at some of the stuff that's thoroughly perplexed you and are on the hunt for answers! This episode might finish Season 2 but it doesn't spell the end of Mysteries of Science. We'll be back soon and looking at some of the most mind bending stuff in the universe.  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.