Scientists are on the trail of a mysterious five-particle structure that could challenge one of the biggest theories in physics: string theory. This rare particle—never seen before and predicted not ...

Add Yahoo as a preferred source to see more of our stories on Google. flyingv43/GettyImages What if every person you meet, including those you've yet to cross paths with, is quietly tethered to you by ...

What if every person you meet, including those you’ve yet to cross paths with, is quietly tethered to you by a single thread you can't even see? That's the premise of the invisible string theory. The ...