National Geographic Society

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Torch vs. Chainsaw

The PVAC or Personal Vacuum Assisted Climber is a vacuum powered climbing device that allows a person to safely scale any flat wall or surface both vertically and laterally in a matter of minutes.

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This episode turns up the volume when Acoustiblok, a thin noise-reduction material takes on the Nathan Air Chime, a screaming train horn that produces the same decibel levels as a jet airplane.