Inside you lies a precise scientific instrument – the ability to observe Nature and recall past experiences. You were born with it and you use it every day. You can be trained to use it more effectively to, for example, compare and discover new species of organisms or new minerals. Our senses do have limitations, and we often use microscopes, telescopes and other tools to aid our observation. However, we benefit from knowing their limitations and the impact they have on our ability to combine our observations and our experience to make decisions. Once these tools replace our direct...