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Festival season is here -- so Vodafone and Bloom.fm have come up with essential gadgets to keep your phone ticking and your tunes kicking.
At the ginormous Glastonbury music fest, it's all about dancing and other such kinetics. Vodafone supplies shorts that turn movement into power, and sleeping bags that do the same with body heat.
Twelve hours of stomping in the Orange Power Wellies keeps your feet dry and gives you enough power to charge a phone for an hour.
Scientists are looking at ways to produce electricity from the vibrations caused by falling raindrops.