Battelle Vortex Ring Gun is one versatile device

UberGizmo: Scientists at Battelle have filed a patent application for a device that shoots rings of gas, which is said to be able to help firefighters and various other jobs. More commonly known as the vortex gun, these smoke ring shooters have been around for years as toys, but scientists have finally discovered how to make them practical for work. Here’s an explanation on how the Vortex Guns function:

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