Researchers have adapted a computer algorithm that mimics the growth of slime mold to help predict the large-scale structure of the Universe: the cosmic web. As the Universe expands, gravity concentrates galaxies into large clusters, pulling more and more material in over time and opening up vast empty spaces called voids. This is similar to the way slime mold extends to search for concentrations of nutrients. Decaying organic material or gas and dust, it's all the same.