You must be aware that most men (and also not only a few women) are by nature not monogamous. This nature makes itself even more forceful when tradition and circumstance stand in an individual's way.

I'm not a genius. I'm just passionately curious.

I have no special talent. I am only passionately curious.

Since I have introduced this term I had always a bad conscience. . . . I cannot help to feel it strongly and I am unable to believe that such an ugly thing should be realized in nature.

Our death is not an end if we can live on in our children and the younger generation. For they are us; our bodies are only wilted leaves on the tree of life.

The dog is very smart. He feels sorry for me because I receive so much mail; that's why he tries to bite the mailman.

Give back to the world at least what you've received.