Using the power of the sun and ultrathin films of iron oxide (commonly known as rust), researchers at the Technion, Israel’s Institute of Technology, have found a novel way to split water molecules to hydrogen and oxygen. The breakthrough, published this week in the scientific journal Nature Materials, could lead to less expensive, more efficient ways to store solar energy in the form of hydrogen-based fuels. This could be a major step forward in the development of viable replacements for fossil fuels.