Letterspacing: The introduction of small amounts of space between letters to satisfy visual requirement and to avoid large word space for justified setting. Also called Inter-character spacing.
So at first glance, you'll see the familiar crisp presentation of multiple fonts and weights, but now with more options for line spacing, cursor types, and more.
Um, it isn't really a scientific law, not in the sense of predicting gravitation mathematically or something, but it's attempting a pattern in the spacing of the planets, and it was noticed by Bode hundreds of years ago.
However, if you're thinking of your notebook as the ultimate source of information when studying, it will be important to think of your handwriting and, most of all, of how you arrange the spacing of your page.
We're spacing them out over 400 square kilometers of sea bed and between each turbine and the next turbine there is a cable all buried into the seabed and all these cables from all these turbines.
Of course you could tell Word to ignore it or just turn the feature off but who would have thought there'd be a war over spacing in the typewriter space.