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Beneath the lilies lies a rotting log, home to a tiny organism that isn’t a plant or an animal or a fungus. It looks like a blob of scrambled eggs, but in fact it’s a slime mold (genus Physarum), an otherworldly creature with 29 variants of sex-controlling genes, dispersed among eight different types of sex cells. To ensure genetic diversity, each slime mold sex cell can only fuse with a sex cell that has completely different variants of genes than its own. If you calculate all the possible combinations of genes and sex cells, you will find that Physarum have more than 500 different sexes. Reproduction for slime molds may be complicated, but it’s never boring.