The interface between biology and physics. For the most part, it works -
the biomolecules are safe in their tube, and the electronics don't get fried.
I'm somewhere in the intersection of molecular biology, applied physics,
analytical chemistry and applied mathematics.
At any rate, the degree should state "Biophysics," and I enjoy working on
pretty much any problem within this realm.
Well, maybe the last bit's not quite true. I have a thing for ribosomes.
But there are worse addictions (e.g. photography, metal work, hiking California).