10. Velcro
Well, Velcro was intentionally made material, but the way, the idea was born in the inventor’s mind accidentally. Actually, it was inspired by nature, and it seems that the idea of replicating this natural property of plants only fell on the mind of George de Mestral, Swiss engineer and nature lover in 1941. So, (more than) once he was on one of his long walks when he realized lots of thistles stitched to his clothes and his dog, and that was how the idea of making such material was born, but it took him long eight years of studying before the first Velcro was created.
Pixabay/Public Domain
