“All organisms can make the most basic distinctions--between food and not-food, danger and safety, light and dark, same-species and not-same. But only people can use language to make the highly complex categorizations of, say, animals or physical forces, or however… — Scott Huler Copy Share Image
Quarks came in a number of varieties - in fact, at first, only three were needed to explain all the hundreds of particles and the different kinds of quarks - they are called u-type, d-type, s-type. — Richard P. Feynman Copy Share Image
