The Louisiana Department of Health and Hospitals has issued a weird warning: if you have to irrigate your sinuses with water for some medical reason, don't use tap water. The reason: your brains may get eaten by the Naegleria fowleri.
Fairy wasps are some of the tiniest creatures on Earth, an entire insect roughly the size of a single-celled organism like an amoeba. That means their individual cells must be incredibly tiny...and that requires losing much of their nervous system.
Humans like to think we invented agriculture, but a single-celled organism might have us beaten by several million years. An amoeba species known as "Dicty" finds bacteria, moves them to the best location, and harvests them like crops.