Cola by citric or other isolated acids. Coca-Cola's recipe is maintained as a corporate trade secret. A variety of different sweeteners may be added to cola, often partly dependent on local agricultural policy. High-fructose corn syrup (HFCS) is predominantly used in the United States and Canada due to the lower cost of government-subsidized corn. In Europe, however, HFCS is subject to production quotas designed to encourage the production of sugar; sugar is thus typically used to sweeten sodas. In addition, stevia or an artificial sweetener may be used; "sugar-free" or "diet" colas typically contain artificial sweeteners only. In the 1940s, Coca-Cola
Baratunde A. Cola involved in the founding of the NanoEngineered Systems and Transport Lab and Heat Lab at Georgia Institute of Technology, where he is an associate professor in the George W. Woodruff School of Mechanical Engineering and the School of Materials Science and Engineering. For 2015–6 he was a Martin Luther King Jr. visiting professor in the Department of Mechanical Engineering at the Massachusetts Institute of Technology. Specilizing in carbon nanotube technology, Cola led the team who demonstrated the first optical rectenna. In addition he is involved in research into the development of thermo-electrochemical calls that produce electricity from waste heat. Cola