[From the introductory “Thanks and Notes”:] People tell you to write what you know, but I’ve found that writing what you know is much harder than making it up. It’s easier to research a historical period than your own life, and it’s much easier to deal with things that have a little less emotional weight and where you have a little more detachment. It’s terrible advice! So this is why you’ll find there’s no such place as the Welsh valleys, no coal under them, and no red buses running up and down them; there never was such a year as 1979, no such age as fifteen, and no such planet as Earth. The fairies are real, though.