The galactic center is a unique natural experiment in strong gravity.
"The best children's books are those that respect the intelligence of the child."
我是那种精神不正常的人。
出门没有衣服,进家没有粮食,内心积有耻辱之感,就会一起来发动暴乱,而且无法禁止。小槛黄花共醉