Write. Microwave. Repeat.
In the old days paper was such a scarce commodity that people would erase what was written on it and reuse sheets of it. Luckily, paper isn't such a scarce commodity these days, but it's still a good idea to use less of it. Enter these notebooks. Fill 'em up, pop 'em in the microwave, and they're suddenly blank and ready to be reused. Luckily, microwaves aren't a scare commodity these days either.