A watch worn by a particle of light would not tick at all. Light realizes the dreams of Ponce de Leon and the cosmetics industry: it doesn't age.

Greene has worked on a particular class of symmetry relating two different Calabi–Yau manifolds known as mirror symmetry (concretely relating the conifold to one of its orbifolds). Aspects covered in this book include non-local particle entanglement as it relates to special relativity and basic explanations of string theory. After attending Stuyvesant High School Greene entered Harvard in 1980 to concentrate on physics.

He also described the flop transition a mild form of topology change showing that topology in string theory can change at the conifold point. Brian Greene (born February 9 1963) is an American theoretical physicist and string theorist.