In a windowless room in a London basement, there's a device on the wall that makes things disappear. Technicians file in, grasping large containers shaped like drug capsules and stuffing bags into them. One places his container into the device, taps in a code on a panel, and whoosh, it's gone. A few minutes later, the capsule reappears a kilometre away. The device employs a technology that was supposed to have faded away decades ago -pneumatic tubes.
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