So often in technology-intensive areas, I don't know if there is a deep reason behind some fundamental aspect of the field. It's comforting to know that inventors make sensible decisions, given the conditions of the time. Videogrunt's explanation of the origins of the 4:3 aspect ratio made me laugh. I'll never forget it. It makes good cocktail party small talk (okay, only within a geeky subset of people, but that's pretty much everyone I hang out with), and it will help me understand display formats with greater depth while authoring. Very professional, memorable and entertaining.