This was an epoch making book for me – it was the first book I read on a Kindle. I think the Kindle is great, especially for quote miners like myself. You can highlight passages, and then with the help of an Applescript (google it), one can download the highlighted passages to note taking software EverNote. Genius. If they handled PDFs and note-taking better, I’d be very tempted to dispense with printing papers altogether.
As for the book, it was very enjoyable reading. The topic of the book is the progress made towards understanding the natural world made during the Middle Ages, which are often portrayed as an intellectual dark age. Here are a couple of notable passages:
- I’ve heard some (usually not historians) claiming that the Medieval universe was small and pokey, obviously the product of small minds and blinkered imaginations. As far back as Boethius in 500 A.D., we see the opposite view: “It is well known and you have seen it demonstrated by astronomers, that beside the extent of the heavens, the circumference of the earth has the size of a point; that is to say, compared to the magnitude of the celestial sphere, it may be thought of as having no extent at all.”
- Similarly, Hannam addresses the idea that the Copernican revolution displaced Earth from its honorable place at the centre of the universe: “Another modern misconception about the medieval Christian worldview is that people thought the central position of the earth meant that it was somehow exalted. In fact, to the medieval mind, the reverse was the case. The universe was a hierarchy and the further from the earth you travelled, the closer to Heaven you came.”
- Why do experiments? Because there are many ways that the universe could have been, and the only way to find out is to go and see. The physical universe is not a logical necessity, and thus its properties cannot be deduced. It’s surprising how long it look for this idea to catch on: “For Aristotle, the iron shackles of logical necessity determined what the laws of nature had to be. They were not just the ones upon which God had deliberately decided, they were the only ones he could have used. Even if God had actually created the world, he would have had no choice about how it turned out.”
- A few years ago, Sydney University hosted a “comedy” debate about who was greater, Einstein or Newton. Physics (somewhat arbitrarily) defended Einstein against the mathematicians. Everyone’s favourite supervisor was heard to disparage the great Sir Isaac by saying that he ascribed gravity to “the occult”. It seems, however, that this was not a reference to witchcraft, but rather just the word associated with action at a distance: “Nowadays, the word ‘occult’ specifically means ‘magical’ or something connected to spiritualism. But it used to have a much wider sense, connoting any force or property that was hidden. Put bluntly, if you cannot see it, it could be classed as occult. Aristotle had little time for the concept and argued that all effects must be material. One thing, he said, can only affect another by touch.” (more…)
Letters to Nature 