When this feast of the patron saint of Ireland lands on a Sunday, as it does today, the pattern is even more pronounced, he says.

WSJ: Watch for a Post-St. Patrick's Day Selloff

James Glanz has an excellent piece in the Sunday New York Times and continuing today on how much power is consumed by data centers in the U.S. To provide fast response time, they operate near full capacity much of the time, and waste up to 90 percent of their energy consumption.

FORBES: Data Centers As Power Hogs -- Will Green Issues Impact High Frequency Trading?