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Did you know that sperm cells are technically immortal? We didn't either... Our guest this week is Charlotte Mykura, a doctor of Epigenetics, researching the behaviour of DNA when cells divide, and not content with just one PhD is now working towards a medical doctorate.She takes us on a dive into the inner workings of the cells we're made of, how they save us from a million things every minute, and how it can all go wrong...

Have you ever wanted to be abducted by aliens? What if you need to pee when walking on the moon?  We blast off into space with Dallas Campbell and talk about flat earthers, the dark days of Mir, and how much the Apollo 11 flag cost.  Don't understand how space works? Neither do we...

Ever wondered what cavemen really ate? This week's guest, Evolutionary Anthropologist Colette Berbesque, sheds light on some of the fundamentals of being human. From humans being intrinsically irrational, to the paleo diet being made up, and hunter gatherers being much better gatherers than hunters, Colette overturns some myths about our early ancestors, and what they can tell us about who we are today.

Ever heard of the Lake Titicaca Scrotum Frog, or the dromedary jumping slug? Neither had we... Simon Watt, evolutionary biologist and President of the Ugly Animal Society, takes us through the complexities of natural selection. From why there is no perfection in evolution, to what Natural Selection's greatest invention is, and culminating in the future of the human species, Simon takes us on a journey through the survivors of the biggest perpetrator of genocide in history: Natural Selection.

Did you know that all the gold on earth came from neutron stars colliding? Or that we don't really know what dark matter is? Neither did we...  Dr. Harry Cliff is the guest on this episode of "I Don't Understand", and takes us on a voyage through the cosmos both near and far, and clears up some mysteries in the process.