Popular Science Kills Online Comments
(The PS editorial in question can be found here)
I'm sure that it'll take most people reading either of those a scant 2.27 seconds on average to figure out why they're doing it, but considering that one of my first bits of advice to anyone reading an online article practically anywhere these days* is "whatever you do, don't read the freaking** comments!" I'm hardly surprised they decided to go this route.
*(There are exceptions, usually in terms of sites that make you register or identify yourself somehow. Quelle surprise.)
**(Not a word beginning with "F" that I would normally use, but I'm trying to be nice and polite today.)