multi-processing
Once upon a time multi-processing was harder. I remember the days of a terminal (not computer!) connected to the ARPANet via 1200-baud modem, watching the next Usenet article sloooowly appear on the screen. It's not like I could do anything else electronic in parallel. Sometimes I did menial tasks like paying bills in parallel, but mostly I think I put up with it. Windowing systems set us free.
Now, I'm often doing a bunch of things at once, and this sort of thing is a minor speed bump rather than a noticable problem. In fact, my morning routine pretty much consists of, in parallel: reading two streams of email, checking half a dozen comics, checking the company Wiki, checking the day's meetings, updating and compiling my source tree, and reading news headlines. If the folks who came up with the ad strategy aren't just desperately guessing, they must have reasons to believe that people will sit and wait for their comic strip. Do enough people really do that?

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Sometimes I invest that time in figuring out how to defeat the ad for next time I visit the site.