US President Barack Obama awards the National Medal of Technology and Innovation to Dr. Nancy Ho, Green Tech America, Inc. and Purdue University, IN, for the development of a yeast-based technology that is able to co-ferment sugars extracted from plants to produce ethanol, and for optimizing this technology for large-scale and cost-effective production of renewable biofuels and industrial chemicals at the White House in Washington, DC, on May 19, 2016. / AFP PHOTO / Nicholas KammNICHOLAS KAMM/AFP/Getty Images
