Barzelay has never been afraid to turn a pop song into a mission statement: For proof, check out Clem Snide's masterful "I Love the Unknown, " which Barzelay helpfully tacks on as a bonus track to Lose Big.

NPR: Eef Barzelay: A Blueprint For Finding Love

The bonus is that the iPad--when equipped with certain apps--also lets users do things like track their hikes and identify area attractions.

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