I remember being completely blown away in undergraduate physics classes by how much of the world can be exactly and precisely explained by various subject areas of physics (kinematics, gas laws, thermodynamics, etc.) Then at some point I ran in to a wall with quantum mechanics and particle physics where I had to throw up my hands. I was contemplating going to graduate school for a masters in physics but I decided against it. It's vexing that there are such disparities within the subject (not that there aren't in others as well, but Physics seems especially afflicted).