English: Ryan Valentine scores the goal that keeps Wrexham in the Football League. (Photo credit: Wikipedia)

In their most recent book, Think Like A Freak, Steve Levitt and Stephen Dubmer tell the story of the penalty kicks in soccer to highlight how incentives move us. According to them, the data shows that 75% of all penalty kicks at the elite level are successful. That’s a high rate, but what can you do if you want to improve a little bit?…