He discovered that the science he'd once thought of as the whole world of knowledge is only a branch of philosophy, which is far broader and far more general. The questions he had asked about infinite hypotheses hadn't been of interest to science because they weren't scientific questions. Science cannot study scientific method without getting into a bootstrap problem that destroys the validity of its answers. The questions he'd asked were at a higher level than science goes. And so Phaedrus found in philosophy a natural continuation of the question that brought him to science in the first place, What does it all mean? What's the purpose of all this?