We might spend hours puzzling over a cryptic crossword instead of using a search engine to find the solution. We learn this early in life. As children we are taught through experience and persuasion that effort leads to reward and over time this conditions us to enjoy effort for its own sake. This is known as learned industriousness. While backpacking, more than 20 years ago, I visited the stunning coloured lakes of Kelimutu on the island of Flores in Indonesia. The lakes change colour every few years, making them a mysterious and spectacular sight.
