 Metal nanoclusters are atomically precise clusters of metal atoms with controlled sizes, shapes, and electronic states. These clusters can be used as catalysts due to the unique properties such as high surface area, small size, and tunable electronic structure. By controlling these properties, it is possible to tune the catalytic activity and selectivity of metal nanoclusters. This article was authored by Wai Huilei, Xu Anhe Zhao, and Xuankuan Zhang.