现实是，你知道，作为一个黑人，巴拉克去趟加油站都可能被开枪打死。
The realities are that, you know, as a black man, Barack can get shot going to the gas station.
Mathematics is the foundation upon which the edifice of science is built.
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
You can’t please everyone, so don’t try.
科学不仅是对世界的描述，也是世界的一部分。
The past is never dead. It's not even past.
