The study of strongly correlated Fermi liquids in a magnetic field has had its ups and downs. If we put the proper spin on this interest, we can say that our theoretical understanding and the currently available methods of producing high degrees of polarization are creating new directions for this field. In the late 70's and early 80's a considerable amount of research activity was centered on the physics of spin polarized ³He. High degrees of spin polarization were achieved by rapid melting and optical pumping. Apart from its academic interest, there has been some applications of spin polarized ³He, including the enhancement of MRI images of guinea pig lungs. More recently, the advent of non-destructive magnetic fields in the megagauss regime has made it possible to explore a variety of physical phenomena in strongly correlated electronic materials, including high temperature superconductors and heavy-fermion materials. I plan to survey these materials where the use of high magnetic fields and the production of high spin polarization can and has lead to new and exciting physics.