Professor McCork and Ms Hucklebuck are coming live from the sky as they ask 'How does a parachute work?' Back in the studio, Colin and Doctor Knowles have the task of getting them down safely but these things are never straightforward when McCork is involved!

Professor McCork and Doctor Knowles ask 'How long would it take to walk the Earth? Meanwhile, the normally fearful Colin embarks on a solo Wilderness Survival Challenge. Things could get very creepy.

It's roller disco day and everybody is having lots of fun, except for Doctor Knowles who just can't quite seem to get the hang of it! The crack TV science team investigate the big question 'How many atoms are there in our bodies?'.