From what I've seen the ISS is doing very interesting work on plasma physics in space due to having free high-vacuum available and the ability to inject highly-visible tracer particles into a plasma chamber which don't settle out, this also allowing interesting mixed particulate/plasma states.

http://www.nasa.gov/content/space-station-illuminates-dusty-plasmas-for-a-wide-range-of-research/stationresearch/#.VFo2yoWxt2M