“What is the biggest known star?” and “How do fans make you feel cooler?” BBC Click Radio presenter Gareth Mitchell answers life's big questions
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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.