Interesting, because I find myself writing formulae to my notebook all the time. It's not differential equations all the time, but I'm generally making sure tha

Interesting, because I find myself writing formulae to my notebook all the time. It's not differential equations all the time, but I'm generally making sure that something is scaling correctly, or the things I'm doing are the ones I really want. I would love to have a board at office, but instead I have tons of notebooks which I finish, scan, shred and recycle.