It was at the vanguard of aviation technology in the 1950s, and it's still going strong today: meet the B-52 Stratofortress.The B-52 heavy bomber continues to show that old doesn't have to mean outdated, even in an era of rapid technological change. Just the opposite: through good maintenance and occasional updates, vintage tech can hold its own against flashier but more expensive, and more finicky, next-generation (and next-next-next-generation, even) designs. The very first flight of a Boeing B-52 took place 60 years ago this weekend.