world war 3 , will it happen?

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News of potential strikes on Iran are getting more and more coverage in the press. North Korea , China not to mention all the terrorists, it seems that everyone wants a piece of someone, whats going on? Have we learnt anything from the past? The difference this time is that almost everyone has real nuclear power. I fear for my kids, I fear for the ordinary guy in the street that just wants to live in peace. Are we really capable of letting this happen again? What do you think? It scarey but the world really does seem more volitile with every year. Is it inevitable?