1. World Atlas HD
Download: World Atlas HD
If you think free maps on the Internet leave something to be desired, the National Geographic Society's World Atlas HD app might be the app for you. It lets you search high-resolution world maps; you choose whether to view them in classic style, with an antique look, or in satellite form. Consult details for specific countries, including land area, population, languages spoken, major religions, type of government, and natural resources. World Atlas HD is available for iPad.
This app is designed to provide easy access to Wikipedia from your smartphone or tablet. You can bookmark individual entries and sections within an entry, or perform a dictionary search within Wikipedia without leaving the page you're consulting. Wikipanion is available for iPhone, iPad and iPod touch.
3. Math Formulas — Reference Guide
Download: Math Formulas — Reference Guide
No more scrawling down mathematical formulas on little scraps of paper; this app remembers them all for you. Formulas are sorted by mathematical discipline (geometry, calculus, algebra and so on), and most are accompanied by examples of how they're used. This app is available for iPhone, iPad, and iPod touch.
9. Skrambler X
Download: Skrambler X
A solid option for art history buffs is the Skrambler X game. The app helps you unscramble paintings by more than 30 famous artists including Degas, Rembrandt and Van Eyck. It's a good mental workout, and poring over the images provides a painless way to learn about each artist's signature subjects, colors and brushstrokes. Skrambler X is available for iPad.
10. Easel SAT Prep Lite
Download: Easel SAT Prep Lite
If you're studying for the SAT, this prep app could come in handy. It consists of a sample workbook with three sections, just like the real SAT. Each section has 25 questions which you can answer by scribbling on the blank space provided. If you find yourself stuck, a limited number of questions have a ShowMe feature that lets you watch a step-by-step demo of how to tackle that item. Easel SAT Prep Lite is available for iPad.
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