Why do cats purr?

We fly up into a fluffy cumulus cloud with Ayesha Tandon, and learn about where clouds come from - and what they’re made from. The rhythm of the rain on the window leads us into our song of the week.

Professor Carolyn Ross jumps into a bowl of cereal to answer this important question - and we learn about how useful food science can be for young children. Learn more about your ad choices. Visit podcastchoices.com/adchoices

Weather presenter Alex Deakin joins us at the heart of a thunderstorm as we learn how thunder and lightning are created. Learn more about your ad choices. Visit podcastchoices.com/adchoices

We learn about what an echo is - and how bats use echoes to get around, visiting a bat cave with Biologist Professor Kate Jones. Our batty music uses the singing of bats with a jazz twist. Learn more about your ad choices. Visit podcastchoices.com/adchoices

Professional Space Nerd Dr Jen Gupta takes us to the beginning of the universe - the moment before the big bang - and we learn about the signs of the big bang that are still with us today. Our big banger uses the sound of the birth of the universe to make a party anthem.