| 13593 | Newton showed that falling to earth and orbiting the sun are essentially the same [Newton, by Ellis] |
| 13605 | Gravity isn't a force, because it produces effects without diminishing [Mayer] |
| 20636 | Newton is a special case of Einstein's general theory, with an infinite speed of light [Einstein, by Close] |
| 21236 | Instead of gravitational force, we now have a pervasive gravitational field [Farmelo] |
| 21167 | Gravity is unusual, in that it always attracts and never repels [New Sci.] |