Today we got out of school and entered a FOUR DAY WEEKEND -- yippee! :-D Happy Valentine's Day Eve, everybody.

My new favorite thing in the world is Helium-4 at (or below) 2.17 Kelvin. At that point it becomes a "superfluid", a really weird liquid with zero viscosity. Somehow they can crawl up the side of jar & over the top, and then come back out again, too. It's really weird! :-D