When Stan Lee first pitched the idea of Spider-Man in 1962, his boss was full of objections: People hate spiders. Teenagers aren't lead characters; they're sidekicks. He should be glamorous and successful, not a friendless loser. But Stan persisted and Martin Goodman let him give the unlikely hero a tryout in Amazing Fantasy, which was already slated for cancellation. With Spider-Man on the cover, No. 15 shot to the top...