Tubes have carried cats, mail, and people for a really long time. Vox's Phil Edwards leads the tour...

More than a century and a half before Elon Musk thought up the Hyperloop, his mash-up of pneumatic and maglev ideas (and a bunch of other moving parts), people were using pneumatic tubes to move people. Though we're familiar with pneumatic tubes from banks, they've been around much longer and used for a lot more.

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