If a theory can predict those things that you should observe if it is right and can also predict those things that you should observe if it is wrong,it is said to have the virtue of falsifiability.

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Falsifiability is a key criterion in scientific theories where a theory can be tested by experiments and observations which are designed to refute it. If a theory can be tested, and specifically can be falsified, it satisfies the criterion of falsifiability.

If a Theory Can Predict Those Things That You Should