Picture yourself changing your car after ten years of ownership. And imagine if the main features of the car – its top speed or fuel efficiency, say – had improved at 10 per cent per annum. Your new wheels might have double the fuel efficiency or more than double the top speed. Generally, that doesn’t happen. But for many of the technologies discussed in this book, it is exactly what happens. In fact, a number of these technologies effectively improve at rates of 20 to 50 per cent (or more) per year.
