In this week's episode, the team delve into the world of digestion, as Jo attends a gut health interactive exhibition in Melbourne to explore the mystery that is our gut microbiome. The team also learns more about our circadian rhythms to find out how those "sleep, rise, eat and repeat" cycles really work. Plus Gerald fills us in on the link between vitamin D and calcium, all our questions about vaping are answered – is it just an excuse to smoke? – and the team take a look at the present every 50 year old gets in the mail and why it can save lives in the battle against bowel cancer.