In the autumn of 1941, a Swiss electrical engineer named Georges de Mestral came back from an alpine hunting trip near Commugny covered in burdock burrs — the little brown seed pods that cling to trouser cuffs and dog fur with maddening tenacity. Most people would pull them off and swear. De Mestral put one under a microscope.

What he saw would sit in his head for a decade: the burr wasn't sticky, wasn't magnetic, wasn't glued. It was a forest of tiny, elastic hooks, each one snagging into the loops of natural fibers in his clothes and his dog's coat. Pull them off and they sprang back, undamaged, ready to hook again. Nature had invented a reusable fastener.

It took de Mestral eight years, a small loan, and a stubborn refusal to listen to textile mills that told him it was impossible before he cracked the manufacturing problem: weave nylon under infrared light so the loops become stiff enough to be sliced into hooks. He filed his first Swiss patent in 1951 (CH 295,638), and in 1958 he filed the definitive US application. It issued on November 21, 1961 as US Patent 3,009,235, "Separable Fastening Device."

He named it Velcro — a portmanteau of the French velours (velvet) and crochet (hook).

The patent itself is a beautifully clean piece of engineering. Claim 1 describes two mating strips: one carrying "a multiplicity of hooks," the other "a multiplicity of loops," designed such that pressing them together produces "engagement between said hooks and loops" that resists shear but yields cleanly to a peel force. That single trade-off — strong against sliding, weak against peeling — is the reason Velcro works the same on a sneaker, a blood-pressure cuff, and the outside of a spacesuit.

NASA adopted it almost immediately. Apollo astronauts had Velcro sewn into their gloves, food trays, and helmets so tools wouldn't float away. The Space Shuttle carried hundreds of Velcro patches in the crew compartment. Every ISS cargo bag today still uses hook-and-loop closures for exactly the reason de Mestral identified in 1955: it works one-handed, in a pressure suit, in zero-g, with no batteries.

But the deeper legacy is intellectual. De Mestral's patent is arguably the founding artifact of biomimicry as an engineering discipline — the idea that 3.8 billion years of evolution has already solved most problems, and the job of the engineer is to read the answer key. From that lineage:

• Gecko-inspired dry adhesives (Autumn, Full, Cutkosky, 2000s) — micro-hooks and van der Waals forces let a robot climb glass, patented as reusable adhesive tape.
• Sharkskin drag-reduction surfaces — riblet films now coat commercial airliners and Olympic swimsuits.
• Lotus-effect self-cleaning coatings — micro-textured superhydrophobic surfaces on glass, fabric, and solar panels.
• Microneedle drug-delivery patches — arrays of tiny hooks that anchor into skin, direct descendants of the hook-and-loop principle scaled to microns.
• Surgical tissue fasteners — hooked micro-arrays that grip organ walls without sutures.

De Mestral's company sold the patent rights, and Velcro Industries became a global brand. But the more valuable legacy isn't the fastener — it's the method. A hunter with an itchy pair of trousers looked at the problem the wrong way (annoyance) and then, crucially, looked at it the right way (design specification). Modern soft robotics labs and materials-science departments now do this on purpose, with electron microscopes and funding lines. De Mestral did it with a hand lens and a dog.