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Published online 8 September 2005 | Nature | doi:10.1038/news050905-14

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Power packs harness hikers' energy

Walking helps you run your mobile electronics.

Hikers toiling under the weight of a heavy backpack needn't just get hot and sweaty from their efforts. Some of the energy they expend in walking can now be captured by a backpack devised by US researchers, which converts it to electricity that can power portable electronics.

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