Evil Pete writes: Thomas Robert Malthus' essay on population is very well known. However, what is less known is that in 1803 Malthus wrote a new edition which was dramatically larger including new and more subtle ideas. Because this later edition was much larger publishers tended to publish the short 1798 edition instead. When they did publish the 1803 edition they often removed large sections of the book. Here is a fascinating radio talk that looks at Malthus anew taking into account the neglected editions. I found the result astonishing.