If everything in the world had to be divided into two bins — one for living things and one for nonliving — the task might seem easy. Trees, bacteria and humans are alive; rocks, smartphones and ...
A koala bear isn’t actually a bear, it’s a marsupial. Whales aren’t fish, they’re mammals. Tomatoes aren’t vegetables, they’re fruit. Almost nothing is actually a nut. Peanuts, brazil nuts, cashews, ...