Abstract
Last month you reported the introduction of the "h-index", where h is the number of papers you have published that have each been cited at least h times (September p7). Someone with an h-index of 50, for example, has published 50 papers that have each been cited at least 50 times. It was therefore apposite that the same issue carried a feature on Sir Arthur Eddington (pages 33–38), because he devised something that was conceptually the same, albeit applied to a very different field: cycling.