Frederick Gosselin, a professor at Polytechnique Montreal, demonstrates the elasticity of a parachute in Montreal on Tuesday, Sept. 30, 2025. A project led by professors David Melançon and Frederick Gosselin in Polytechnique Montreal’s Mechanical Engineering Department has developed a parachute made from a plastic sheet cut in a "closed-loop" kirigami pattern. THE CANADIAN PRESS/Christinne Muschi