technologi_reel_ on Instagram: "Angular momentum sounds complex, but this simple demonstration makes it unforgettable. As the person spins on a stool, small changes in arm position completely change the speed of rotation. Arms out, the spin slows. Arms in, everything speeds up. Nothing magical—just physics doing exactly what it promises. This principle explains far more than a classroom trick. It’s why ice skaters pull their arms in to spin faster, why planets stay in stable orbits, and why bicy