A new printing method, developed by Harvard researchers, uses soundwaves to control the size of liquid droplets in order to print biopharmaceuticals, cosmetics, and food. The printer uses sound waves to pull the droplet off the printer nozzle once it reaches a specific size. The lower the amplitude, the larger the droplet. Most importantly, the soundwaves do not travel though the droplet so the liquid is not compromised in anyway. Learn more about printing with soundwaves at Harvard University.