You’re right of course—in the quoted part I link to the wikipedia article for “almost surely” (as the analogous opposite case of “almost 0″), so yes indeed it can happen that the effect is actually 0, but this is so extremely rare on a continuum of numbers that it doesn’t make much sense to highlight that particular hypothesis.

You’re right of course—in the quoted part I link to the wikipedia article for “almost surely” (as the analogous opposite case of “almost 0″), so yes indeed it can happen that the effect is actually 0, but this is so extremely rare on a continuum of numbers that it doesn’t make much sense to highlight that particular hypothesis.