3 ideas
| 6004 | The cardinal virtues are theoretical (based on knowledge), and others are 'non-theoretical' [Hecato, by Dorandi] |
| 18202 | The concept of a field gradually replaced the substances in explaining relations between charges [Einstein/Infeld] |
| 1513 | The Egyptians were the first to say the soul is immortal and reincarnated [Herodotus] |