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The return of pneumatic tubes
(www.technologyreview.com)
This is a most excellent place for technology news and articles.
When I was young I remember that banks often had large drive-thrus with pneumatic tube systems at each car stall.
There would only be one teller but they could serve quite a few lanes.
If you wanted a cash withdrawal, you might put your ID and your withdrawal slip in the tube, and a few minutes later it would come back with cash in it.
It was pretty rad. But ATMs seem like a better bet overall.