If you twist something — say, spin a top or rotate a robot’s arm — and want it to return to its exact starting point, ...

“A single application is never sufficient, but applying this doubled, rescaled force guarantees an exact return,” boasts ...

Earth moves around the sun at 67,000 mph and makes a full rotation once every 24 hours. So why can't we feel the Earth's rotation? When you purchase through links on our site, we may earn an affiliate ...