The most exciting moments in mathematics are when you discover that two seemingly unrelated areas are deeply connected.

"I don't want to just be a singer. I want to be an entertainer."

森林是我们星球的肺；我们必须给予它们应有的尊重。

And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.