i'm going to start with you, najmedin meshkati ncalifornia. size up for us right now the situation at the most endangered nuclear plants. >> based on what we hear from your reporters, from itn and also the morning news that i checked, the biggest practical right now is the spent fuel of reactor number 4, which has basically lost all its water and the water has boiled out. and according to the chairman of the u.s. nuclear regulatory commission, yesterday, he also said the same thing. right now, this reactor number 4 spent fuel pool, which doesn't have any containment building, because spent fuel pools are not within the containment building, and the roof on this reactor number 4 has been blown out, which is, i think, the most riskiest and most hazardous element that we have over there. >> woodruff: arjun makhajani what, would you add to that? >> well, you know, each reactor has two elements at risk. there's a reactor, which is like a pressure cooker, and you have the-- to carry away the heat from the pressure cooker regularly because it's gener