Why is the Moon moving away from the Earth, and what would have been the consequence of it being closer to us millions of years ago? Also, why does Covid-19 anosmia stop me smelling Vick's Vapour rub but I can still feel its effects? Do models have more neck bones to account for their longer necks? Why do some people float but others sink in the swimming pool? And how does lightning work: does it travel upwards, downwards, or neither? Like this podcast? Please help us by supporting the Naked Scientists

Why do we fall asleep when we don't want to? Will going without sex harm your health? Why do aircraft resort to black boxes when they could send data to satellites? Why don't brakes overheat and lock on? Can you create a 1 degree angle? And why does Earth look flat for people on the surface when we all know it's not really flat? Join Dr Chris Smith and Talk Radio 702's Azania Mosaka for the answers... Like this podcast? Please help us by supporting the Naked Scientists

Good news on the Covid-19 vaccine front from the UK, why South Africa isn't using AstraZeneca's vaccine, is the Universe under threat from "strangelets", why has evolution not solved the ageing problem, why ice sticks to an empty glass, the PCR test for Covid-19, and how to stop cats killing wildlife... Like this podcast? Please help us by supporting the Naked Scientists

Will loud music deafen my dog? Why are some dog breeds more docile than others? Why do Covid-19 outbreaks follow cycles of boom and bust? What gives a person their "second wind"? Why do ants invade my kettle and other electronic devices ? Is ant invasion in you home a sign that the place is dirty? Why have I got vibration sensations in my foot? Join Dr Chris Smith and 567 Cape Talk's Saskia Falken to find out... Like this podcast? Please help us by supporting the Naked Scientists

This week we talk vaccines for Covid-19, especially the Novavax trial results, and hear why it might be possible to tune into radio waves with your teeth. We also discuss Covid and cytokine storms, bubbles in the Milky Way, where the sharks go during a tsunami and how radioactivity is used to power spacecraft... Like this podcast? Please help us by supporting the Naked Scientists

This week, Dr Chris and Kieno Kammies talk Covid-19 vaccinations, explore whether ivermectin might be a helpful coronavirus drug, explain how maggots get into wounds, unpick what's in the Covid-19 vaccine, and talk nanoparticles... Like this podcast? Please help us by supporting the Naked Scientists

This week, journey times to Mars, how stars come by the matter inside them, why some people feel compelled to eat paper, how coronavirus antibody levels correlate with Covid-19 severity, whether water really goes down the drain in different directions on opposite sides of the Earth, and why a yawn produces a spray of saliva. Join Dr Chris Smith and Azania Mosaka for the answers. Like this podcast? Please help us by supporting the Naked Scientists

This week, Aza catches coronavirus, Covid-19 vaccines, viral variants and where are the mutations in the SARS-CoV-2 genome, can you still swallow when you're upside down, how was Einstein proved right, and what causes cramp? Dr Chris Smith has the answers... Like this podcast? Please help us by supporting the Naked Scientists

How do energy drinks give you a buzz? Why do planets orbit on a plane? Should we test for Covid-19 infection before we vaccinate? Do energy drinks cause diabetes? Why do you float on the Dead Sea? How does the Plimsoll Line on a boat work? When does Covid infectivity cease after death? What's your first and last organ to die? How do planets orbit? And what's the best way to get rid of rat poison? Join Dr Chris Smith for all the answers... Like this podcast? Please help us by supporting the Naked Scientists

How do point of care tests for Covid-19 work? Are they any good? How infectious are people asymptomatically infected with Covid-19? Why do different car indicators flash at different rates? How do accents work and where do they come from? How many Earths could fit inside Jupiter, and what is the "giant red spot"? Does wearing a facemask have any negative health impacts? Do hailstorms only happen in the daytime? Join Dr Chris Smith and Tshego Modisane for the answers... Like this podcast? Please help us by supporting the Naked Scientists