In scientific work, those who refuse to go beyond fact rarely get as far as fact.

In scientific work, those who refuse to go beyond fact rarely get as far as fact.

A theory is no more like a fact than a photograph is like a person.

A theory is no more like a fact than a photograph is like a person.

You have to know you can first. How comes later.

You have to know you can first. How comes later.

I never once made a discovery ... I speak without exaggeration that I have constructed three thousand different theories in read more

I never once made a discovery ... I speak without exaggeration that I have constructed three thousand different theories in connection with the electric light ... Yet in only two cases did my experiments prove the truth of my theory.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very read more

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very idle.

You cannot run a business, or anything else, on a theory.

You cannot run a business, or anything else, on a theory.

A young boy is a theory, an old man is a fact.

A young boy is a theory, an old man is a fact.

It is the theory that decides what can be observed

It is the theory that decides what can be observed