The AdS/CFT correspondence is a powerful tool for understanding quantum gravity.
关键是设定现实的客户期望,然后不仅要满足它们,还要超越它们——最好是以意想不到和有益的方式。
夜晚是一个自己照亮自己的世界。
Every improvement in the circumstances of the society tends either directly or indirectly to raise the real rent of land, to increase the real wealth of the landlord, his power of purchasing the labour, or the produce of the labour of other people.