It has long been known that when two different kinds of atoms clump together, some of the resulting clusters are more stable than others. Physicists in the US and Germany have now devised a rule that predicts the ratios of aluminium and hydrogen atoms that will form such stable clusters. They also say that the clusters could be packed together to form a new type of material that can store hydrogen for use as an energy source (Phys. Rev. Lett. 98 256802).
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