{"subjects": ["Force and energy", "Mass (Physics)", "Newton, isaac, sir, 1642-1727", "Special relativity (physics)"], "subject_people": ["Isaac Newton Sir (1642-1727)"], "key": "/works/OL4058607W", "title": "Newton and the concept of mass-energy", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL756875A"}}], "type": {"key": "/type/work"}, "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2009-12-10T05:15:02.565144"}, "last_modified": {"type": "/type/datetime", "value": "2023-10-17T02:20:16.902491"}}