So far, the three Japanese reactors experiencing cooling problems haven't released significant amounts of radiation, but the situation is dangerous, as an explosion Monday morning in Japan damaged a pump bringing in cooling seawater at one reactor and a third reactor began experiencing cooling problems Monday afternoon.

WSJ: Uranium Firms Take Hit After Earthquake

In the Northeast, the heavy snow that fell over the weekend was still causing problems Monday.

CNN: Northeast digs out; storms hit Upper Midwest, South

Mr. Orcutt and Ms. Sadik-Khan said Monday that the technical problems with the system had been fixed.

WSJ: Bike Sharing Gets Into Gear