What he said.
Also, denim, even old worn denim, provides surprisingly high armour class against axe blows; either that or I inherited my great-great-grandfathers bones...
Speculations on astronomy, astrophysics, news I find interesting,
theoretical issues, science and science policy.
In particular: gravitational radiation sources, black holes, planets and astrobiology.
I will digress into computational physics, science fiction and general issues and basically whatever I feel like whenever.
And, of course, cats.
Steinn Sigurðsson is an astrophysicist at Penn State.