If you have cable, browse YouTube, enjoy Hulu, or partake in any activity that involves viewing video ads, there's a solid chance you've seen a Lumosity ad. But on the off chance that you haven't, here's one (and you thought browsing a blog would keep you safe).

Lumosity is a service that promises to train your brain in areas related to memory, speed, attentiveness, problem solving, and others. The website launched in 2007 and has millions of members, but many users come via a mobile app that has, thus far, only been available for iOS.

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