You know, in the Middle Ages, in England, when you met a very poor person, that person would be described as an "unfortunate" -- literally, somebody who had not been blessed by fortune, an unfortunate.

The most important word in science is not 'Eureka!' but 'That's funny...'

You can’t put a limit on anything. The more you dream, the farther you get.

What we see changes what we know. What we know changes what we see.

Success is not final, failure is not fatal: it is the courage to continue that counts.

过去是一道永不消散的阴影。