lagrangian

lagrangian dynamics is a great method to set up equations of motion. what's so great about it is that once you get all the coordinates set up correctly, you're basically blindly taking derivatives and whatever you get will be consistent, provided you don't make algebraic error.

when jumping from high in a tree,
just write down del L by del z.
take del L by z dot,
then t-dot what you’ve got,
and equate the results (but quickly!)

matt sent me this whole conspiracy thing. a quite interesting watch.

a student in my section who promised me we'd get together for some special brownies told me about allofmp3.com. online encoding, cheap too. good way to legally download music. i found wilson phillips' hold on and duran duran's ordinary world. more songs for natalie. w00t.