When Aaron Goldstein was a student at UPenn’s Wharton School of Business, one of this friends was suffering from leukemia. During chemotherapy, his friend had to take frequent body temperature readings, and if it got too high he needed immediate medical attention. He went to bed one night with a normal body temperature and then woke up in the middle of the night with a high fever and needed to go to the ER. Aaron saw a simple solution to this problem.

Aaron developed Fever Smart, which is an app that monitors a person’s body temperature constantly with a thermometer patch that goes on the underarm. The patch sends live data to the app, allowing the user can track the temperature changes over time and will even be notified if the patient’s body temperature gets to dangerous levels. By providing continuous updates, body temperature can be monitored during sleep and notify the user long before the ailing person wakes up in a sweat and needs to be taken to the hospital.

From his work with Fever Smart, Aaron was named Entrepreneur Magazine’s College Entrepreneur of 2014. You can now order a Fever Smart patch and app for $130.