5 ideas
| 15716 | If axioms and their implications have no contradictions, they pass my criterion of truth and existence [Hilbert] |
| 1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
| 20645 | Heat is a state of vibration, not a substance [Joule] |
| 20972 | Joule showed that energy converts to heat, and heat to energy [Joule, by Papineau] |
| 5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |