Karl Popper's Conclusions About Good Theories

It is easy to obtain confirmations, or verifications, for nearly every theory — if we look for confirmations.     Confirmations should count only if they are the result of risky predictions; that is to say, if, unenlightened by the theory in question, we should have expected an event which was incompatible with the theory — an event which would have refuted the theory.     Every "good" scientific theory is a prohibition: it forbids certain things to happen. The more a theory forb...