brain trainingJoy and a couple of her lady friends are hooked on the Lumosity brain training games; she plays them on her computer every day for 15-30 minutes. Bob prefers playing bridge and trying to figure out why politicians never answer a question directly.

The games are now on an Android app. Basic membership is free for a limited number of games, or $15 a month for the full list. There’s a two-week free trial of that full list. Adding it all up, there are about 50 million users.

The games test your wits in the areas of memory, flexibility, attention, problem solving, and speed. Joy has become a speed demon — in the top one percent of players in her age group. She swears she’s getting smarter by the day, though she still can’t remember where she put her cell phone.

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