Have we got the project for you: [Robert Hart]’s vortex cannon design. We’ve seen vortex cannons before, where you usually fix a balloon to the back of a trash can. Pull on the balloon ...

Inspired by the concept but lacking a giant laser, [Tom Stanton] build a small craft powered by a vortex cannon. Creating a vortex is hard enough, but creating a vortex with enough oomph to travel ...

A forensic analysis suggests it could have been a Vortex weapon fired from a point near the protesters. Serbian President Aleksandar Vucic has said, "There is no sound cannon in the Serbian Army." ...