"Why do people behave differently in a crowd?" and "How did dinosaurs mate?" BBC Click Radio presenter Gareth Mitchell answers life's big questions
Deep sea diving? There’s an app for that. If you dream of exploring underwater worlds like Jacques Cousteau but don’t want the inconvenience of getting wet, then this iPad-controlled sub lets you explore the seas from a safe distance. It’s got an HD camera mounted on its nose, which sends a video feed through a 75m-long cable to a ‘topside box’ that stays on dry land and transmits a stream to your tablet via its own wi-fi network.