First broadcast: Tuesday 11th March 2014
Hank thinks new boy Ben is totally cool, and is amazed to discover that the feeling is mutual. But will Ben feel the same if he finds out about Hank's learning difficulties? Hank isn't willing to take the risk and so decides not to tell him. That plan has disastrous consequences when Hank misreads an experiment, leading to the gassing of Ms Adolf and the evacuation of the science block.