Not a comprehensive list--but here are some I love:
  1. Birthday of Adolphe Sax
    309d2c5f cf6a 41f4 8d38 9b3c921d5313
  2. End of the Mayan Calendar
    14476ee9 1493 4130 9118 98879b2284f6
  3. Birthday of Niels Bohr
    0f190f25 b111 4c49 ae66 1c7293133c23
  4. Birthday of Rodin
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  5. SOPA/PIPA
    832b766f 95a2 4fa0 a962 da1c6684e937
  6. Birthday of Bram Stoker
    8ab18e5e 78af 4bc9 a20f 81443d2cfcd5
  7. Birthday of Gustav Klimt
    F54019bb 5d5f 42eb b9a1 2d37dec02a3a
  8. Birthday of Fellini
    7508e544 a0ea 4b1d 8a08 87a6be73de23
  9. Birthday of Franz Kafka
    83eccd3b a398 4f98 9b8c d5f6c2083c21
  10. Birthday of Charles Dickens
    5839272a 811d 4891 89f6 9385aed95c0d
  11. Birthday of Anna Pavlova
    F8392f14 15c4 4e44 b9fe 5a79c1e3e9d4
  12. Birthday of Francois Truffaut
    2dd7c69e b03f 46ac 953c 401cd9229958
  13. Birthday of the dude who made the zipper
    C88bb953 3e26 454b a479 9ac8ce72a3ce
  14. Birthday of Robert Doisneau
    8834be42 d939 4a4b 816a 47f8b48f17d5
  15. Anniversary of 1st drive-in movie
    11949314 4cb1 4f97 8541 b358e5b88231
  16. Birthday of Ada Lovelace
    9588e433 1ac9 4d9f 9d36 ededd400d1dc
  17. Birthday of Gustav Flaubert
    Af24c686 5ca0 4b2c 91ef 8920ae1f23d6
  18. Birthday of Ella Fitzgerald
    8d67b722 9273 4b12 9b60 4570c7fd1284
  19. Birthday of Edward Gorey
    82f062e7 3925 4cc5 9b42 dfa75197a3b9
  20. 150 years of the Tube
    B9111253 527d 4948 b4e8 c7a9b74601ea
  21. 50th anniversary of Doctor Who
    C3acab99 31fe 47e0 9aee 5498c500edcf
  22. Birthday of Copernicus
    99f40071 1075 4f67 8f88 7770584f5055
  23. Anniversary of "I Have a Dream" speech
    351023ee 5bae 4655 bd0e 0f874d113d69
  24. Birthday of Kandinsky
    1f1b77c4 ae12 40e7 910e 701db59b0494
  25. Birthday of Jules Verne
    8248850e 8d8f 4315 8df3 3075020701eb
    (Personal fave; the best one I've ever seen)
  26. Winsor McCay's Little Nemo comic
    597474b6 7197 4c51 a0fb c770a9cb4457
  27. Birthday of Houdini
    0c5834c7 6cbc 48e6 bff2 6947f4a3f0dd
  28. Birthday of Amelia Earhart
    Fc06ead1 8c80 4162 869d ef3ddb004d8c
  29. Birthday of Foucault
    70a0897e db13 47e7 a99f 88e5f772694d
  30. Birthday of Ida B. Wells
    2a1c4faf 19b4 42a8 bbcb 346baa21060f
  31. Water found on Mars
    93562488 1c0c 4acf 9278 64ed273188b7
  32. Birthday of Langston Hughes
    3da37ae4 20d8 4643 9a5f e9b0a615972e
  33. Birthday of Rorschach
    C83b4676 b3ee 40d3 a871 e21b3d0e48fe
  34. Anniversary of Statue of Liberty's delivery
    815c8655 a42f 4712 a070 05ad333f59b4