An interesting finding in the age of athletes and performance-enhancing drugs: a new study concludes that confirmed steroid user Jose Canseco had a more positive effect on his teammates' performance than any other baseball player in the '80s and '90s:

Using panel data, we show that a player's performance increases significantly after they played with Jose Canseco. After checking 30 comparable players from the same era, we find that no other baseball player produced a similar effect.

Read the full story at Barking up the wrong tree.