Another important distinction between physics and, say, psychology is that the latter studies aren't testing a theory, they're testing an observation. A particu

Another important distinction between physics and, say, psychology is that the latter studies aren't testing a theory, they're testing an observation. A particular observation sometimes leads to the widespread assumption that a particular effect exists, but without anyone trying to shape a theory about its cause, only that it exists. In physics by contrast, it's all about fitting an observation into existing theory.