except....no one ACTUALLY knows how the fucking voltage/current senses BEFORE ANY POSSIBLE MEASUREMENT, how to divide (no really, it doesn't. I probed this as 2nd year, had an elec lecturer that was quantum physics prof, and he couldnt tell me, but maybe it was just cos it was too long), or how fire works. Really, the core chemistry of why oxygen does what it does under heat is not understood (according to a quite clever housemate).