Sayan Biswas, featured above, has developed a new kind of "plasma igniter" that he thinks could replace traditional spark plugs and help gas-burning cars run more efficiently. PHOTO-ILLUSTRATION BY NEWSWEEK; SOURCE IMAGES BY GETTY Biswas became fixated on this idea as a graduate student at Purdue University in the early 2010s. After a decade of chipping away at the problem at a government laboratory and then in academia, Biswas has built a gadget the size of a box of cornflakes that he thinks could vastly increase the efficiency of internal combustion engines—so much so that standard gas-burning cars could potentially get 100 miles to the gallon.