They say there are no stupid questions. That’s obviously wrong; I think my question about hard and soft things, for example, is pretty stupid. But it turns out that trying to thoroughly answer a stupid question can take you to some pretty interesting places.

Randall Munroe, What If?: Serious Scientific Answers to Absurd Hypothetical Questions

L’autore è quello di xkcd, e il libro è da leggere, e spero che prima o poi ne esca una traduzione italiana.