Turnstiles may be one of those things that, if you ever find yourself thinking about it, may seem like a thing of the past. But they're still out there, doing their thing in train stations and what not all over the globe. But, let's face it -- it's been a long while since they've seen any kind of upgrade. So, if they were to get an upgrade, why not one that utilizes the energy that gets produced every day by people passing through them?
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