Natural experiments can provide valuable insights into economic questions.
Psychology must be a science of description, not explanation.
"Los silencios en una novela suelen gritar más fuerte que las palabras."
You can't put a limit on anything. The more you dream, the farther you get.
The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil and no good, nothing but blind, pitiless indifference.