Show interesting discoveries made about a card after already owning it

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I bought this card while I was in Berlin. I found it in a shoebox of ephemera that a street vendor was selling. I thought it was cool that it had Jesse Owens on it.

But later I found out the story of the man Jesse Owens is next to; Luz Long. Long was a German athlete who was one of the few Olympians in general who became friendly with Owens during the games, giving Owens advice on the track and saving Owens from a critical fault during the long jump.

A few years after the games Long was killed in action during World War II. But Owens had such fond memories of his time with Long during the games that he served as best man at Long's son's wedding nearly 30 years later: