Mentos Answering Machine Does Anyone Have Links To Any Sites Explaining The Diet Coke And Mentos Thing?

Does anyone have links to any sites explaining the diet coke and mentos thing? - mentos answering machine

I need a scientific explanation for why exploding Diet Coke or Pepsi, when mixed with Mentos. My little brother has a science project about it and we have facts. Please reply if you have reliable links to sites that explain it.