It must be possible for an empirical system to be refuted by experience.

There is no pure, disinterested, theory-free observation.

It is the rule which says that the other rules of scientific procedure must be designed in such a way that they do not protect any statement in science against falsification.

Simple statements are to be prized more highly than less simple ones because they tell us more; because their empirical content is greater; and because they are better testable.

The conspiracy theory of society... comes from abandoning god and then asking: "Who is in his place"

Our belief in any particular natural law cannot have a safer basis than our unsuccessful critical attempts to refute it.

The only way to test a hypothesis is to look for all the information that disagrees with it.