on progress

when someone first decided to swear at his enemy rather than throw a rock at him, civilization was born.

on diffusion

mom: oof... my eyes hurt from all this marking!
me: aw! would you like some chamomile tea?
mom: no, thanks. i've been drinking chamomile all day.
me: no, i mean for your eyes...
mom: i'm sure the tea has reached my eyes.