Best apps...

For unexpected fun

teaches Spanish in the most enjoyable way—with the help of Latin pop music. The $1 app plays videos of popular songs and provides translations of the lyrics. The melodies make the words easier to remember, and Lirica reinforces the grammatical lessons with games.

helps connect digital-age pen pals. Create a profile outlining your interests, and the app will set up a conversation with a faraway stranger. Slowly even mimics the snail-mail experience by postmarking messages and creating a delay between when messages are sent and received.

coaches users on how to experience lucid dreams—dreams in which the sleeper can control how the dream unfolds. Luci also functions as a multimedia dream diary, complete with a sketch pad, and it comes with a noise-activated recorder, in case you talk in your sleep.

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