The Fermi Paradox
Space is big. Really big. You just won’t believe how vastly, hugely, mindbogglingly big it is. (Rest in peace, Douglas Adams). Now here’s a great two part video explaining the nature of and possible answers to the Fermi Paradox. Not only does the narrator have a smooth British accent, but he even manages to throw in the Kardashev scale, gray goo, and Matrioshka brains to boot.