Although from about 1850 to 1925 many grammarians stated otherwise, it is now widely acknowledged that adverbs sometimes justifiably separate an infinitive’s to from its principal verb {they expect to more than double their income next year}.

Sometimes it is perfectly appropriate to split an infinitive verb with an adverb to add emphasis or to produce a natural sound… A verb’s infinitive or to form is split when an intervening word immediately follows to {to bravely assert}. If the adverb bears the emphasis in a phrase {to boldly go} {to strongly favor}, then leave the split infinitive alone. But if moving the adverb to the end of the phrase doesn’t suggest a different meaning or impair the sound, then it’s an acceptable way to avoid splitting the verb. Recasting a sentence just to eliminate a split infinitive or avoid splitting the infinitive can alter its nuance or meaning—for instance, it’s best to always get up early (always modifies get up) is not quite the same as it’s always best to get up early (always modifies best). Moreover, sometimes “fixing” a split infinitive makes the sentence sound unnatural, as in it’s best to get up early always.

I don't think it's new to the 16th edition, but it also bears mentioning that, in addition to the split-infinitive myth, The Chicago Manual of Style also dismisses the whole fetish of never ending a clause with a preposition:

The "rule" prohibiting terminal prepositions was an ill-founded superstition. Today many grammarians use the dismissive term pied-piping for this phenomenon.(5.176)

Jesse Vernon seems to be among the few American journalists not terrified by mathematics. As one who has often been thwarted -- yes, not "one who often has been thwarted" -- by folks who spasmodically redline who and whoever whenever to is in the vicinity, I loved his explanation of how nested parentheses can be used to break up clauses.

I'm getting the feeling Vernon may even be able to convert among percentages, fractions and decimal approximations without throwing off the result of a calculation by whole orders of magnitude.

A rare gem, indeed! Bravo.