Rachel Maddow delivers another tutorial on Japan's nuclear crisis:
The situation continues to worsen at Japan's Fukushima Dai-ichi power plant. That in mind, Rachel Maddow dedicated her second segment in four days to articulating exactly what is at stake in northeastern Japan, illuminating in lay terms, the physics at work in a failing nuclear reactor. She also brought on David Lochbaum, director of the Nuclear Safety Project for the Union of Concerned Scientists, to explain the consequences of the blasts that have rocked the power plant in recent days.