I would like to fly in space.Absolutely.That would be cool.I used to just do personally risky things， but now I’ve got kids and responsibilities， so I can’t be my own test pilot.That wouldn’t be a good idea.But I definitely want to fly as soon as it’s a sensible thing to do.

Life is too short to be anything but happy.

最伟大的故事是那些让我们改变的故事。

物理学和数学之间的界限并不像我们想象的那么清晰。

只要不放弃，梦想终会实现。