Bombing Iran has put one of the most successful treaties ever in doubt

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Almost every country on Earth has signed it — the Treaty on the Non-Proliferation of Nuclear Weapons, widely known as the "NPT." It became effective on March 5, 1970. At the time, US President Richard Nixon called it "a historic occasion" and a "first milestone" on the road toward lasting world peace. The NPT has held for all these years, and today, only nine countries have nuclear weapons. But after Israeli and US airstrikes on Iran's nuclear facilities, there's speculation that Iran might quit the NPT and other nations could follow suit, by pursuing nuclear weapons technology themselves. The World's Matthew Bell reports on where the NPT stands now.