It's down to the final four in the U.S. nationals of the Microsoft Imagine Cup, in which student entrepreneurs develop apps and other products using Microsoft software. They all got there with a little help from what Microsoft called "academic evangelism." Alex Ryu, now a senior at Penn, was doing an internship in the healthcare field in India when he noticed two things: that many women forgot to come in for certain appointments, and that mobile technology was ubiquitous, even in rural areas.
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