Ever heard of “swarm intelligence”? Ant colonies use it to establish the quickest paths between food and their nests. Scout ants leave a trail of pheromones (a chemical substance) as they make their way to edibles. More ants follow, causing the scent on the trails to become even stronger. Over time, the best routes become more popular and scented, while the less-efficient paths steadily decrease in both the number of ants traversing them and the pheromones left behind. “Swarm intelligence” allows ant colonies to consistently find the best paths to the nourishment they need.