You may have heard the phrase ‘we know more about the moon than the deep sea’ – it’s now an old phrase, dating back to 1948. In fact, we actually know quite a bit more about the ocean than you might think – which physicist and oceanographer Helen Czerski shows in her new book Blue Machine. But it’s still full mysteries, and that’s why Helen says that the secrets of the moon and the ocean are incomparable, because when it comes to the ocean there is just so much more to know, and we urgently need to uncover more. In this episode we speak to Helen about some of the secrets hidden – and found – in the ocean’s currents, including shipwrecks and missing planes, what we’ve learned from rubber ducks and Finding Nemo, and the swirling currents in underwater rivers and waterfalls. Learn more about your ad choices. Visit podcastchoices.com/adchoices

In this episode we speak to Alexandra Horowitz, professor of canine cognition at Barnard College, Columbia University and author of Inside of a Dog – What Dogs, See, Smell and Know. She tells us what your dog is trying to tell you when they stare at you, what causes them to tilt their heads from side to side and why so many of them seem to like rolling in poo. Learn more about your ad choices. Visit podcastchoices.com/adchoices

It goes without saying that breasts get a lot of attention. But less focus is given to the science behind them: why do we have them? Why are they all different, and does it matter? What happens when things go wrong? GP and author Dr Philippa Kaye is out to change that in her latest book, Breasts: An Owner’s Guide. In today’s podcast she tells us about the science of human breasts, the benefits – and costs – of having them, current research in breast cancer and sports, and how to take care of yours. Learn more about your ad choices. Visit podcastchoices.com/adchoices

From HG Well’s The Time Machine, to Doctor Who and Back to the Future, time travel has become a beloved staple of science fiction. But will humans ever actually be able to jump through time? According to physics, quite possibly. To explain this today, we’re joined by Lawrence Krauss, theoretical physicist and author of the new book The Known Unknowns: The Unsolved Mysteries of the Cosmos. He delves into the strangest theories of time travel, time tourism, and also what most time travel movies get wrong. Learn more about your ad choices. Visit podcastchoices.com/adchoices

Want to get better at interpreting body language? Well, most books on the topic are unlikely to help you. At least, that’s the argument of Geoff Beattie, professor of psychology at Edge Hill University. He claims that most stereotypes of non-verbal communication, be it defensive arm-crossing or nervous hair twiddling, are vastly misunderstood. In this episode, Beattie unpacks these body language myths – and also explains science worth paying attention to. Learn more about your ad choices. Visit podcastchoices.com/adchoices