Not worth reading for leisure. This was a required read for an Evolutionary Biology Readings course, and this was the least useful of all of them.It feels like the author is yelling at you throughout the book. Gould seems extremely biased.It is worthwhile to read if you need alternate views on intelligence testing or the bell curve, but the mathematics the author puts such emphasis on seems to just criticize.Take a statistics course, it is much more useful than this book and much more worth the money.Gould must have some sort of vendetta that his never-ending introduction puts you in an angry state about science before you get to the actual science in the book.