With his new hands, Kepner hopes to perform small tasks such as changing a light bulb and using a remote control.

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On his ascent of K2 he took a pair of micro-hydroelectric systems to give non-smoky light and heat to two remote villages.

ECONOMIST: Roger Payne

Terahertz light - which lies between infrared light like that used by remote controls and the microwaves in the appliance of the same name - has become popular in scanning technology at airports and museums' back rooms because it can extract information without risk of damage.

BBC: Terahertz scanner reveals hidden fresco at Louvre