Top 10 brain-training apps

2. Khan Academy

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    Khan Academy includes a wide variety of subjects.
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This application allows you to “learn almost anything for free” with a series of more than 4,200 educational videos on a wide range of topics from the Notation of Basic Geometry to Fiscal Cliff tutorials. Additional Khan Academy subject areas (e.g. chemistry, algebra, SAT prep) can also be downloaded from the Apple and Android app stores, if you want to find out more on a specific topic.

Compatibility: iPhone, iPad, and Android

Cost: Free

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