Vaccine creator and Scientist Katie Ewer joins Dan for this week's Science Weekly podcast talking the science behind vaccines and why snot and scabs are so important! We catch up with Sidney McSprocket who is teaching us about Great British Scientists - this week its Sir Charles Wheatstone and Sir Jonathon Hive. Whilst the deadly velvet ant is the subject of Dangerous Dan. In Kareena's Chemistry we find out about plastics impact on climate change and how you can help. Plus in Science in the News, Dan talks about why fish are cheering and the newest astronauts that NASA have recruited that could be set for the moon!