http://www.smithsonianmag.com/science-nature/string-theory-about-unravel-180953637/?no-ist Why String Theory Still Offers Hope We Can Unify Physics Evidence that the universe is made of strings has been elusive for 30 years, but the theory's mathematical insights continue to have an alluring pull. Read more: http://www.smithsonianmag.com/scien...-about-unravel-180953637/#H8QrHz1EqmvUyVWY.99