While reading Inside the Box today, I came across the story of Mendelev and how he discovered the periodic table. David talks about how, in a book about sleep, the author mentioned that when he slept, his unconscious mind made sense of all the facts and gave him the solution. Then, David says that's not it. Mendelev had a book contract and he had to write about around 53 elements in a single volume, so he was trying to find a way to group the elements. Of course, this in a book about constraints. The realisation I had, while reading...