Astronomers have developed a new technique called "X-arithmetic" that reveals the hidden physics inside galaxy clusters. By analysing Chandra X-ray Observatory data at different energy levels and painting the results in vibrant colours, researchers can now distinguish between sound waves, black hole inflated bubbles, and cooling gas, enabling them to classify structures by what they are rather than how they look. The method has already exposed striking differences between galaxy clusters and galaxy groups, showing that supermassive black holes wield dramatically different influence on their surroundings.