A tiny version of this physics toy is revealing quantum secrets
Researchers created an atomic-scale version of Newton’s cradle to study thermal equilibrium
![a Newton's cradle](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/06/062718_ec_newton-cradle_feat_free.jpg?fit=860%2C460&ssl=1)
GOT THAT SWING Metal spheres in a Newton’s cradle (shown) swing back and forth rhythmically. The toy has inspired a quantum experiment where atoms replace the balls.
sarawuth702/iStockphoto