This week, Claire finds out what we know, or more accurately don't know, about the new Omicron variant of the SARS-CoV-2 virus, with answers from epidemiologist Raina MacIntyre to some common questions about what it means for the COVID-19 pandemic; and then for a real scare, Stu introduces us to xenobots, manufactured organisms made from cells of the frog Xenopus laevis, which can move about and have acquired the ability to replicate themselves.