任何优秀的飞行员，无论他有多么高的天赋和丰富的经验，都不会不使用检查表。

The only limits in life are the ones you make.

Not for the sake of our health, though it's often presented that way, but because it's an escape from the human anthill. It's an escape from our own competition, and our own dramas. And that's why ween joy looking at glaciers and oceans, and contemplating the Earth from outside its perimeters, etc. We like to feel in contact with something that is non-human, and that is so deeply important to us.

地球的历史写在其地层中。