Yeah, I can't wait

Springy yoyos turn buildings into sources of energy

Buildings, bridges, and people all get rid of excess energy with characteristic mechanical motions. If you want to collect that energy, you need an oscillator with a similar characteristic motion—the same frequency and a similar amplitude. That means you need a pendulum the size of a building to collect waste energy from the building. Which doesn't seem like such a cool idea. A group of researchers have recently shown how a child's toy—the yoyo—can turn these low frequency vibrations into fast rotational motion, allowing for efficient energy conversion without the enormous size.