Associative indexing, the basic idea of which is a provision whereby any item may be caused at will to select immediately and automatically another. This is the essential feature of the Memex. The process of tying two items together is the important thing.

To pursue science is not to disparage the things of the spirit. In fact, to pursue science rightly is to furnish the framework on which the spirit may rise.

There will always be plenty of things to compute in the detailed affairs of millions of people doing complicated things.

Putting a man in space is a stunt: the man can do no more than an instrument, in fact can do less. There are far more serious things to do than indulge in stunts. . . . I do not discard completely the value of demonstrating to the world our skills. Nor do I undervalue the effect on morale of the spectacular. But the present hullabaloo on the propaganda aspects of the program leaves me entirely cool.

Science can give mankind a better standard of living, better health and a better mental life, if mankind in turn gives science the sympathy and support so essential to its progress.

If scientific reasoning were limited to the logical processes of arithmetic, we should not get very far in our understanding of the physical world

Publication has been extended far beyond our present ability to make real use of the record.