A conversation Dustin Onghanseng had with his Hong Kong University of Science and Technology MBA classmate Brian Lin led the pair of them to quit the course and launch Uhoo. The company makes an ultra-sophisticated air-quality monitor for the workplace, featuring nine sensors that track everything from humidity to particulate matter, and provide recommendations for improvements. Its home device has even saved the life of one customer’s father by detecting pollutants that were slow-poisoning him.