Machinery and labor-saving devices are only valuable as they serve to reduce the cost of manufacture.
数学的本质在于它的自由。
I'm not a girl, not yet a woman.
最好的投资往往是那些在当时看起来疯狂的项目。
When you’re young, you presume there’ll be many people with whom you’ll connect with. Later in life, you realize it only happens a few times.
That's one small step for (a) man, one giant leap for mankind.
