Based on the numbers, apparently there should be 1 billion Earth-like planets and 100,000 intelligent civilizations in our galaxy. Which poses the question: Where is everybody? This article presents an array of existing theories in just the right amount of detail. Very insightful. My favourite theory: Higher civilizations are here, all around us. But we’re too primitive to perceive them.

From Weekly Filet #167, in July 2014.