4 ideas
| 22363 | You have only begun to do real science when you can express it in numbers [Kelvin] |
| 20653 | Six reduction levels: groups, lives, cells, molecules, atoms, particles [Putnam/Oppenheim, by Watson] |
| 7811 | Sophoclean heroes die terrible deaths when they oppose the new Athenian values [Sophocles, by Grayling] |
| 20644 | Energy has progressed from a mere formula, to a principle pervading all nature [Kelvin] |