Where Is Everybody?

The universe is old. Really old. About 13.8 billion years old, give or take. It's also big. Incomprehensibly big. Hundreds of billions of galaxies, each containing hundreds of billions of stars. Most of those stars have planets. The numbers get so large they stop meaning anything to the human brain. Here's the thing, though. If you do the math, even conservatively, the universe should be crowded. Not with primitive microbes hiding under rocks. With civilizations. Advanced ones. Civilizations...