4 ideas
| 22363 | You have only begun to do real science when you can express it in numbers [Kelvin] |
| 19216 | Propositions (such as 'that dog is barking') only exist if their items exist [Williamson] |
| 20644 | Energy has progressed from a mere formula, to a principle pervading all nature [Kelvin] |
| 18202 | The concept of a field gradually replaced the substances in explaining relations between charges [Einstein/Infeld] |