| We rely on our muscles to walk, lift objects and climb stairs. However, in space muscles become weaker when there is no gravity to overcome. |
| Loop quantum gravity is a way to quantise space time while keeping what General Relativity taught us. |
| But even after nearly 90 years the theory remains notoriously hard to test because gravity is such a weak force. |
| They allow him unusual balance, enabling him to overcome gravity and stay upright when he should be prone. |
| String theory's claim thus allows quantum mechanics to incorporate gravity and do so successfully. |
| Attached to a single center of gravity by a harness made of strong webbing, hang gliders fly with bodies vertical. |
