6 ideas
19404 | Necessities rest on contradiction, and contingencies on sufficient reason [Leibniz] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
19403 | Each of the infinite possible worlds has its own laws, and the individuals contain those laws [Leibniz] |
20972 | Joule showed that energy converts to heat, and heat to energy [Joule, by Papineau] |
20645 | Heat is a state of vibration, not a substance [Joule] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |