Nuclear Reactors in Japan

How does a nuclear reactor work?  What's happening to the reactors in Japan?  This video from the University of Nottingham explains the answers to these questions and others, very clearly.

"Following the earthquake and tsunami in Japan, we discuss what is causing problems at the nuclear reactors in Fukushima."

If you're interested in chemistry, you can see more  videos on the Periodic Table of Videos YouTube channel and  at the website http://www.periodicvideos.com/