Two newly-published Apple patent applications suggest an unexpected Apple interest in hydrogen fuel cells, AppleInsider notes. The first, Parallel fuel stack architecture, suggests a way of arranging cells into a stack. A common problem with stacks is said to be a tendency toward a single point of failure in a connected series. There can also be many kinds of vulnerabilities, such as degradation of the electrolyte, accumulation of nitrogen in the anode, and water flooding in the anode or cathode. The reliability of stacks can go down as the number of cells grows,
