We humans may believe we rule the world. We're at the top of the food chain. We build skyscrapers. We fly to the moon and back. We have iPhones.
But for an unsettling indication of what lies literally beneath our feet, go to South Sudan. Check out the towering termite mounds (obelisks, actually) that rise from the sun-baked earth, taller than most trees and solid as concrete. Think about how these monuments were created: millions of tiny termites munching their unseen way through life, generation after generation depositing their poop into communal skyscrapers of their own making. We're definitely outnumbered. You've got to admit, it's a bit sobering.