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Popper, and those who agree with him, categorize many types of ideas as unfalsifiable, particularly in psychology and religion.  For example, the proposition "Joe beats his children because his father beat him" is unfalsifiable, because we cannot perform a test in which Joe was ''not'' beaten by his father, and see if Joe still beats his children.  Because the proposition is not testable, according to falsificationism, it is no better than any other hypothesis, and therefore not useful, and not scientific.

Popper, and those who agree with him, categorize many types of ideas as unfalsifiable, particularly in psychology and religion.  For example, the proposition "Joe beats his children because his father beat him" is unfalsifiable, because we cannot perform a test in which Joe was ''not'' beaten by his father, and see if Joe still beats his children.  Because the proposition is not testable, according to falsificationism, it is no better than any other hypothesis, and therefore not useful, and not scientific.

A good example of an unfalsiable concept is [[Black hole|black holes]]. By definition, they cannot be seen and thus are unfalsifiable.  

A good example of an unfalsifiable concept is [[Black hole|black holes]]. By definition, they cannot be seen and thus are unfalsifiable.  

==Carl Sagan==

==Carl Sagan==