A high-tech twist on an old idea – running on springs – could give human-powered movement its biggest boost in more than a century.
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Groundwater is out of sight, but it shouldn’t be out of mind. As cities struggle to cope with drought, we should remember that our largest stocks of water are hidden deep underground.
For those with reduced mobility and even just the normally aging, stairs can pose a big problem. A cheap and efficient new prototype could help.
