Experience is what you get when you didn't get what you wanted.

Brick walls are there for reason. And once you get over them-- even if someone has practically had to throw you over-- it can be helpful to others to tell them how you did it.

I understand the arguments about how the billions of dollars spent to put men on the moon could have been used to fight poverty and hunger on Earth. But, look, I'm a scientist who sees inspiration as the ultimate tool for doing good. When you use money to fight poverty, it can be of great value, but too often, you're working at the margins. When you're putting people on the moon, you're inspiring all of us to achieve the maximum of human potential, which is how our greatest problems will eventually be solved. Give yourself permission to dream.

When you do the right thing, good stuff has a way of happening.

Engineering isn't about perfect solutions; it's about doing the best you can with limited resources.

When you do something young enough and you train for it, it just becomes a part of you.

If she doesn't really love you, then it's over. And if she does love you, then love will win out.