A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die and a new generation grows up familiar with it.

Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are a part of the mystery that we are trying to solve.

I frame no hypotheses.

-- Isaac Newton

The seeker after truth is not one who studies the writings of the ancients and, following his natural disposition, puts his trust in them, but rather the one who suspects his faith in them and questions what he gathers from them.

-- Ibn al-Haytham

Measure what is measurable, and make measurable what is not so.

-- Galileo Galilei

The first principle is that you must not fool yourself -- and you are the easiest person to fool.

-- Richard Feynman

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

-- Avicenna

It is almost impossible to make a clear and accurate statement about chemistry without resorting to the language of weights and measures.

-- Antoine Lavoisier