The project of self-evolution demands an understanding of humanity’s relationship with tools, which is mysterious and defining. Some scientists, like the archaeologist Timothy Taylor, believe that our biological evolution was shaped by the tools our ancestors chose aeons ago. Anecdotally, when people describe what matters to them, second only to human relationships is usually the mastery of some demanding tool. Playing the guitar, fishing, golfing, rock-climbing, sculpting and painting all demand mastery of stubborn tools that often fail to do what we want. Perhaps the key to these and other demanding technologies is that they constantly require new learning. The brain is stimulated and forced to change. Conversely, when things are too easy, as a species we may become like unchallenged schoolchildren, sullen and perpetually dissatisfied.