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For millions of diabetes sufferers, life is a constant battle to keep their blood sugar balanced, which typically means they have to test their glucose levels and take insulin throughout the day.

"Until then, this had been just a class project." Samit Gupta is co-founder, with Robert Rushenberg, of the start-up O2 Insights, based in Menlo Park, California. In 2009, he took the Technology Venturing class at Ohio State University.

Vocal cord paralysis can strike as a result of a stroke, disease or trauma to the head or neck, thereby making breathing, swallowing and speaking difficult.