No longer necessary to put 2 spaces after each period. Save the key stroke.
Steve's tips on periods:
Place periods after bullet points that express a complete thought. Fragments don't get one. If you choose to ignore this, at least be consistent throughout your document or PowerPoint slides.
Periods make horrible bullet points. Use an emdash (see below) or double hyphen (see Dash below). Or try this: turn on the Number lock key (Num Lock); then type Alt +0183 > Enter. You'll get a dot.
No periods... ...after contractions | don't ...ordinal numbers | 1st | 2nd | 3rd | 4th ...nicknames | Barb ...shortened words | taxi, ad ...acronyms | KPRC, TV ...numeral after names | Henry VII