Which came first? · Tricky

Which came first: Blood groups or Hasbro?

Blood groups came first, in 1901 (discovered). Hasbro followed 22 years later, in 1923 (founded).

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  1. First1901

    Blood groups

    discovery · discovered

    Karl Landsteiner discovered the main human blood groups in 1901.

    Checked against Wikipedia and Wikidata

  2. Second1923

    Hasbro

    company · founded

    Hasbro began in 1923 selling fabric remnants, then pencil cases, long before toys.

    Checked against Wikipedia and Wikidata

All which-came-first pairs · About Older Than You Think · Quiz games

Years from Wikidata, each checked against the item’s English Wikipedia article on 2026-10-18. A year stands for what its label says: a founding, a first patent, a premiere.