Happy Pi day, everyone. Yesterday, I heard the siren call -- okay it was more of ding-dong-ding -- of the ice cream truck. This surely means spring is on the way. It feels as if many people are off on spring vacation this week. So take a break from the beach, and the college cheating scandal (which continues to dominate the headlines), to consider a rather big transaction that was announced yesterday. Brookfield Asset Management is buying 62 percent of Oaktree Capital Group.