Typography for lawyers/Typographie für Rechtsanwälte

From the website Typography for Lawyers: Some lessons on this website will involve discretionary choices. This one is mandatory. You must always put exactly one space between sentences. I understand that many people were taught early in life to double-space their sentences. I was too. But double-spacing is a habit held over from the typewriter age. It has never been part of standard typography. Because typewriter fonts were unusually proportioned, a double space helped set off sentences better. Today, since we don’t use typewriter fonts, double spaces aren’t necessary or desirable. Let’s see that paragraph again, but with double spaces: I understand that many people were taught early in life to double-space their sentences. I was too. But double-spacing is a habit held over from the typewriter age. It has never been part of standar…