This may have been obvious from day one, but despite the basic geometry of our necks it took me many years to figure out that back sleepers generally need just the one pillow and side sleepers are better off with two. Still think the pillow industry could do with a shake up though to solve basic problems like not falling into the gap between pillows, pillows made for two or pillows that more flexibly adjust as you turn over.

Back sleepers, side sleepers

Nifty water camouflage practised by dolphins, porpoises, some fish and other neat sea creatures. The simple strategy: look light like the sky for anyone below, and look dark like the sea for anyone above. 

Counter-shading

The best reference I found on quotations was the quotation section in Larry Trask’s Guide to Punctuation. Alongside clarifications [ ] and suspensions … it contains rules on fun things like quotes in quotes, when to capitalise, dealing with mistakes [sic], adding emphasis [emphasis added], and punctuation inside or outside. On this last point he suggests:

"You may follow your own preference in this matter, so long as you are consistent. If you opt for logical punctuation [putting the punctuation outside the quote], you will have the satisfaction of knowing that you are on the side of the angels, but you should also expect some grim opposition from the other side [that prefers punctuation on the inside]."
— Larry Trask

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Quotiquette: The etiquette of quoting