I'm very proud to be black, but black is not all I am. That's my cultural historical background, my genetic makeup, but it's not all of who I am nor is it the basis from which I answer every question.

Space and light and order. Those are the things that men need just as much as they need bread or a place to sleep.

The past is always with us, and it shapes who we are.

科学方法是统一且不可分割的，科学方法既适用于物理问题，也适用于社会问题。