Recent advances in baseball statistical analysis have made it possible to assess the totality of contribution each player makes to team success or failure. Using the metric Wins Above Average (WAA)--the number of wins that the 2016 Red Sox, for example, added because they had Mookie Betts in right field, instead of an average player--the author undertakes a fascinating review of major league baseball from 1901 through 2017. The great teams are...