>negative numbers
>complex numbers
>magnetism
>dark matter
>dark energy
>relativity theory
>quantum mechanics
>spin
I once loved math&physics. Now I don't think so. I'm not filtered by these subjects, it just is that the more I gain knowledge of them, the more I realize that they do not describe reality in a coherent, logical way. There has been a time where scientific theories have been put through realism and logical tests. After 1900s it has not been a case.