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There's a tendency to think that our present politicians are much worse than we had in the past.But we tend to forget how awful our politicians were in the past.

Those who deny freedom to others, deserve it not for themselves; and, under a just God, can not long retain it.

"In mathematics, you don't understand things. You just get used to them."

You are never too old to set another goal or to dream a new dream.

在科學(xué)中最令人興奮的短語(yǔ)，預(yù)示著新發(fā)現(xiàn)的，不是“我找到了！”而是“這有點(diǎn)奇怪……”

I don’t need to fit into anyone’s box. I’m comfortable in my own skin.