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The doctors make the most of Mr Grumbles' weekly shower to demonstrate how your hair has a secret skill that enables it to measure moisture in the air.
There is chaos in the kitchen lab as Baby LiLou joins the doctors to reveal why you need kneecaps. Find out how your knees work with a simple Do Try experiment!
The doctors look at scabs and explain why they shouldn't scratched - unless it's a Do Try edible scab!