Leave a bagel on the counter for a few days, and you’ll probably notice purple splotches growing over it. At some point a mold spore wafted across the kitchen, landed on the bagel, and started to eat your food. Molds are a kind of fungus–just like toadstools, brewer’s yeast, and death cap mushrooms. They don’t just nosh on bagels. Fungi exist on all continents, and have been thriving for many hundreds of millions of years. Some break down the remains of animals and plants in the soil. Some provide nutrients to trees and crops through their roots, in exchange for a supply of carbon the plants make with sunlight. While fungi have evolved different shapes and sizes, they are all