Ammonia might be the world's most under appreciated chemical. Without it, crops would go unfertilized and billions of people would starve. Humans started making ammonia in large amounts just over a century ago, and since then the process used to make it, known as Haber-Bosch, hasn't changed much. A new startup, Ammobia, says that it has tweaked the Haber-Bosch process to lower the cost by up to 40%.