What is a Nuclear Reactor Meltdown?
There is serious concern over a nuclear reactor meltdown in Japan. Please could you tell me what it is?
I'm scared because I have no idea what a nuclear reactor can cause to the planet, I've been told it may affect the whole world.
I live in California, and I fear that some radioactive materials may get here and make us sick.
Explain to me what is a nuclear reactor meltdown and if it happens, how many fatalities are expected?