COSTELLO: Maybe this won't come up during your Fourth of July cookout conversation today, but it is a big, big deal in the scientific community. Researchers may have found something they have been diligently looking for, the so-called God particle. So what is this particle, and why is it so important? Atika Shubert tackles that. She's live in London. Good morning.</s>ATIKA SHUBERT, CNN CORRESPONDENT: Good morning. Well, here's how I understand it. I'm not a particle physicist. But the way it's been explained to me by scientists is that the Higgs Boson, also known as the "God Particle", is the last piece of the puzzle in the standard model of particle physics. This is how we understand the universe works. And they have been looking for it for decades. They have never seen it. It only existed in theory. And now they have conclusively proven, they say, with 99.999 percent certainty, and that's the exact number, that it does exist. Now the reason why it's important is because this particle is what gives matter mass. Now what that means basically is that stars, galaxies, planets, all of this need mass to exist. So you and I basically are -- are here thanks in a large part to the Higgs Boson. And that's one reason why it's called the "God Particle."</s>COSTELLO: So if they hadn't found this particle, or if they found this particle didn't exist, what would that mean?</s>SHUBERT: It would have mean all of modern physics as we know it would have been chucked out the window. So it's a good thing they found it.</s>COSTELLO: Yes they would have to start back at square one. Atika Shubert -- I think you did a pretty good job. Thank you very much. Don't forget to weigh in on our "Talk Back" question of the day. We asked you this question. What's your definition of a hero? Your responses, next.
"God Particle" May Have Been Found