Researchers are reporting production of the longest platinum nanowires ever made — an advance that they say could speed development of fuel cells for cars, trucks, and other everyday uses. The wires, 1/50,000 the width of a human hair, are thousands of times longer than any previously made, according to a report in Nano Letters. The creation of long platinum nanowires could soon lead to the development of commercially viable fuel cells by providing significant increases in both the longevity and efficiency of fuel cells.