The practice of physiognomy, as well as that of phrenology, have been summarily discredited by modern scientific research. As it turns out, the bumps on a person's head and one's facial characteristics give virtually no information about personality characteristics. This is an important reminder of the importance of the critical-thinking principle of

Question

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The critical-thinking principle of falsifiability is central in distinguishing scientific claims from non-scientific claims. Physiognomy and phrenology were debunked since they made non-falsifiable claims that could not be tested systematically.

The Practice of Physiognomy, as Well as That of Phrenology