Every genuine test of a theory is an attempt to falsify it, or to refute it.

There can be no ultimate statements science: there can be no statements in science which can not be tested, and therefore none which cannot in principle be refuted, by falsifying some of the conclusions which can be deduced from them.

A theory is just a mathematical model to describe the observations.

We do not know anything - this is the first. Therefore, we should be very modest - this is the second. Not to claim that we do know when we do not - this is the third. That's the kind of attitude I'd like to popularize. There is little hope for success.

What really makes science grow is new ideas, including false ideas.

I personally call the type of government which can be removed without violence 'democracy,' and the other, 'tyranny.'.

No particular theory may ever be regarded as absolutely certain.... No scientific theory is sacrosanct.