Arvind Varma, from left, Purdue University's (Indianna, USA) R Games Slayter Distinguished Professor of Chemical Engineering, postdoctoral researcher Hyun Tae Hwang and doctoral student Ahmad Al-Kukhun review data from a new process for storing and generating hydrogen to run fuel cells in cars and portable consumer electronics. The process, called hydrothermolysis, uses a powdered material called ammonia borane, which contains one of the highest hydrogen contents of all solid materials. (Purdue University photo/Andrew Hancock)