Nothing ages you quite like breaking the entire classical model of physics! Poor Max Planck started as a dapper young gentleman, transformed into a wild-haired mad scientist during his quantum revelation, and ended up looking like he'd seen the universe's deepest secrets (and wished he hadn't). Planck literally invented quantum theory to solve the "ultraviolet catastrophe" problem, thinking it was just a mathematical trick. Then Einstein came along and said "Nope, light actually IS quantized!" and Planck was like "Wait, what have I done?!" His hair never recovered from the shock.