Albert Einstein dreamed of discovering a single mathematical framework capable of describing all of nature's forces. That quest for a unified "theory of everything" continues to this day, and one theory has come closer than any other to finding an answer: string theory. Watch our latest full program release "Loose Ends: String Theory and the Quest for the Ultimate Theory" at bit.ly/2KAyjuU to learn more. Featuring Brian Greene, Marcelo Gleiser, Andrew Strominger, & Michael Dine. | World Science