Corkscrew Jets in Space Tell of Magnetic Fields

"Black Hole Plasma Jet Spotted Tracing Corkscrew Path"
Scientific American (April 23, 2008)

"A new high-resolution study of the hot, charged gas spouting from an enormous black hole provides the most direct evidence yet that such plasma jets are powered by corkscrew-shaped magnetic fields. Researchers say the finding helps clarify the inner workings of blazars, extremely energetic galaxies that flare up unpredictably, driven by central black holes millions of times more massive than the sun."

Pretty cool stuff, if you're interested in such things.