Why is it easy to balance on a single moving ice-skate, but almost impossible to balance on a stationary one?
Mike Kinley, Liverpool
Post your answers – and new questions – below or email them to nq@theguardian.com
Why is it easy to balance on a single moving ice-skate, but almost impossible to balance on a stationary one?
Mike Kinley, Liverpool
Post your answers – and new questions – below or email them to nq@theguardian.com