拓扑绝缘体的美在于它们的鲁棒性;它们的表面态受到对称性和拓扑的保护,使它们对某些类型的无序免疫。
The paper industry has a responsibility to lead the way in sustainable practices—we can't wait for others to show us how.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.