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I would guess it's because Chuck Thacker died. See https://cacm.acm.org/news/218536-in-memoriam-charles-p-chuck-thacker-1943-2017/fulltext https://cacm.acm.org/

• endswapper 9y ago
  I saw that as a post. Can you please explain the symbolism? I took a look at your link, but it didn't jump out me. Is this how HN honors someone who has passed?
  • smt88 9y ago
    https://hn.algolia.com/?query=black%20bar&sort=byPopularity&prefix=false&page=0&dateRange=all&type=story https://hn.algolia.com/?query=black%20bar&sort=byPopularity&...
    • endswapper 9y ago
      Thank you.