Learn how to craft a retractable wrist blade using simple materials like popsicle sticks, hot glue, velcro, and rubber bands. This detailed tutorial walks you through each step, from assembling the ...

Velcro was invented in the early 1940s after a clever Swiss scientist returned from a walk with his dog. George de Mestral was busily removing cockleburs from his own pants and his dog’s fur when he ...