" These examples do not show that theoretical knowledge is worthless. Quite the reverse. A conceptual framework is vital even for the most practical men going about their business. In many circumstances, new theories have led to direct technological breakthroughs (such as the atom bomb emerging from the Theory of Relativity). The real issue here is speed. Theoretical change is itself driven by a feedback mechanism, as we noted in chapter 3: science learns from failure. But when a theory fails, like say when the Unilever mathematicians failed in their attempt to create an efficient nozzle design, it takes time to come up with a new, all-encompassing theory. To gain practical knowledge, however, you just need to try a different-sized aperture. Tinkering, tweaking, learning from practical mistakes: all have speed on their side. Theoretical leaps, while prodigious, are far less frequent. "

― Matthew Syed , Black Box Thinking: Why Some People Never Learn from Their Mistakes - But Some Do