In Pictures: 14 cool, but off-beat inventions

Lots of inventions are not the iPad, but they are still cool, sort of

Here a worker polishes the surface of an unfinished miniature submarine at a workshop of Zhang Wuyi, a farmer in China who is interested in scientific inventions. Wuyi has successfully tested his self-made miniature submarine "Shuguang Hao", which is 3.6 m (12 feet) long, 1.8 m (6 feet) high, has a maximum diving depth of 20 m (65 feet), can travel at a speed of 20 km per hour for 10 hours underwater and is dolphin shaped.

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