Will eating lollies make your kids hyperactive? Leila McKinnon investigates, and the results will surprise you. Is running on concrete any worse than grass or sand? Michael Slater pounds the pavement to find out. What’s the best way to treat a bluebottle sting? Dr. Andrew Rochford endures five painful stings to uncover the truth. Hangovers—we all hate them, but is there a standout cure? Five volunteers test out five cures to put the issue beyond doubt.