What's actually happening when you get the wind knocked out of you? Why does swallowing combat yawning? And could we ever visualise someone else's pain? Dr Karl answers these questions and more on triple j Mornings with Lucy Smith.

If the whole population stood in one spot and ran would the earth spin like a treadmill? What would happen if gravity didn’t exist? And are farts powerful enough to propel you in space? Dave from Glass Animals asks these questions and more on this bonus episode of Science with Dr Karl.