Super Eruptions...Yellowstone Park?

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I live in england so i dont know how this would affect me but I was watching a program on UKtv History about the possibility of a super eruption in yellowstone park. I wondered if anyone can point me in the direction of some reliable information. I would like to learn more about this type of phenomena (maybe because im just morbid like that lol) so any information would be appreciated. Do you think its even possible for it to happen and if so, do you think it would happen in our lifetime?