Chris:

"Remember: you can be your own differential equation fairy. And you can see whether you're a good differential equation fairy or a bad one."


"I won't guarantee it, but I'm pretty sure that by the time I'm finished, second order linear homogeneous differential equations with constant coefficients will be your favorite."

(Concerning biology) "This frog had a heart... not anymore."

"What do you get when you cross an elephant with a mountain climber? Nothing. You can't cross a vector with a scalar."

Chris: "I could use 75, but that's like killing a butterfly with a bazooka."
DSD: "Have you never done that? It's fun."

CC:

"The age of innocence is over and physics is now a matter of life and death."

"The image is as big as the object, even if the mirror is small."