io9 Flashbacks can be funny things. The disclaimer is tucked ways away down at the bottom of the post, and sometimes you'll be 3/4 of the way through when you start to think 'waitaminit... haven't I seen this somewhere before?' and start wracking your brain for your most recent browsing history.

However, when the Powers That Be reposted this nastiness earlier today, I knew right away that an older piece had been bumped up, if only because the gif they led with has been seared indelibly into my memory.

It's such a striking image that it'll probably stick for quite some time, and, given the high rate of turnover on the front page, that's saying something.

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What stuck for you? Which io9 posts are the cream of the crop? If you were going to convince a friend to start reading io9, what would you definitely point 'em towards as a can't-miss, must-read exemplar of the kind of writing that goes on over on the mainpage?