| 1 | The plane defied the laws of gravity. | |
| 2 | It also seems to match with computer simulations of quantum gravity. | |
| 3 | He discoursed impressively on Newton's theory of gravity. | |
| 4 | Unfortunately, there is no place, yet, for the fourth universal force, gravity. | |
| 5 | His calculations relied on assumptions about the physics of ultra-high energies and quantum gravity. |