Problem solving is a search through a space of possible solutions.
拓扑绝缘体的美在于它们的鲁棒性;它们的表面态受到保护,不受无序和缺陷的影响。
改变令人不适,但它是进步的必要条件。
Hope is a good thing, maybe the best of things, and no good thing ever dies.