I need a better accounting system

I didn't realize I forgot to do the second third of passages for Bio chapter 1 and Physics chapter 2. Whoopsie! I need to keep better track of what I've done and what's left to do.

I recently discovered that you should never dumb down your knowledge to your children:

Jr: "Mom, how is gasoline made?"

Me: "Well, oil is pumped out of the ground," *suddenly debating internally if I should go into oil drilling, refining, chemical changes, etc. I'll keep it simple, he's in grade school* "and then hocus-pocus, it's gas."

Jr: *raising one eyebrow and titling his head* "So... you don't know."