Direct thought is not an attribute of feminity. In this, women are now centuries behind man.

I never once failed at making a light bulb. I just found out 99 ways not to make one.

Education isn't play--and it can't be made to look like play. It is hard, hard work. But it can be made interesting work.

Keep on the lookout for novel ideas that others have used successfully. Your idea has to be original only in its adaptation to the problem you're working on.

The value of an idea lies in the using of it.

I have had a lot of success with failure

I know of over 3,000 ways [that] a light bulb does not work.