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Some innovations have an eye on the future; others solve a current problem. Reviveaphone is firmly in the latter camp, and it does what it says on the tin: brings water-damaged phones back to life. Better than any DIY cures (rice in the airing cupboard) it actually uses a liquid solution to remove mineral deposits that have accumulated on the phone's circuit boards. It's easy to be sceptical, but with a 'results or your money back' policy, Reviveaphone may be able to save waterlogged iPhone owners a lot of money.

Coolest inventions of 2013

Technology never seizes to amaze. Take a look at some of the greatest innovations of the year.