Complex sentence: When used as extra dimensions in string theory, an attempt to unify all physics, some Calabi-Yau manifolds that are very different geometrically are exactly equivalent, and this insight is known as Mirror symmetry, and is the subject of a new featured article.
Split into simpler sentences: When used as extra dimensions in string theory, an attempt to unify all physics, some Calabi-Yau manifolds that are very different geometrically are exactly equivalent. This strange insight is known as Mirror symmetry, and is the subject of a new featured article.