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 ...

String theory has long been presented as physicists' best candidate for describing the fundamental nature of the Universe. Yet, at the beginning of the 21st century, it became apparent that most ...

Amanda Peet will use the world's most plentiful toy to help explain one of its most complicated theories. Watch live at 7 p.m. EST and ask question online You can save this article by registering for ...