1. In 138, Zhang Heng's seismograph detected an earthquake in Longxi.

2. In 286, Roman Emperor Diocletian granted the title of "Caesar" to Maximian, making him co-ruler.

3. In 293, Diocletian and Maximian appointed Galerius and Constantius Chlorus as Caesars respectively, starting the Tetrarchy.

4. In 1781, the Continental Congress adopted the Articles of Confederation.

5. In 1790, Congress authorized the first US Census.

6. In 1810, Frédéric Chopin, the Polish composer and pianist, was born.

7. In 1815, Napoleon returned to Paris to restore the throne, starting the Hundred Days' Rule.

8. In 1845, President Tyler signed a congressional resolution to annex the Republic of Texas.

9. In 1864, Rebecca Lee became the first black woman in the US to receive a medical degree, from the New England Female Medical College in Boston.

10. In 1867, Nebraska became the 37th state of the US.

11. In 1872, Yellowstone National Park was established in the US, the world's first national park.

12. In 1903, Zhendan Academy in Shanghai officially opened.

13. In 1905, the Mukden Campaign of the Russo-Japanese War ended.

14. In 1909, American polar explorer Peary explored the Arctic.

15. In 1912, American Albert Berry made the world's first successful parachute jump.

16. In 1914, China joined the Universal Postal Union.

17. In 1918, during World War I, the German army occupied Kiev in Soviet Russia.

18. In 1923, Sun Yat-sen re-established the Grand Marshal's Office.

19. In 1925, the Kuomintang and the Communist Party of China held a meeting to oppose warlord political division.

20. In 1926, Huangpu Military Academy was expanded into the Central Military Academy.

21. In 1932, the infant son of Anne and Charles Lindbergh was kidnapped from their home near Hopewell, New Jersey.

22. In 1932, the Japanese army launched another fierce attack, and the 19th Route Army retreated, ending the Battle of Shanghai.

23. In 1934, Puyi became the "emperor" of "Manchukuo" in Changchun.

24. In 1940, Native Son by Richard Wright was first published.

25. In 1945, the Arab League was established.

26. In 1947, T. V. Soong was forced to resign as Minister of the Executive Yuan due to the Gold Rush Incident.

27. In 1950, Fuchs was sentenced to 14 years in prison for disclosing nuclear secrets.

28. In 1950, Chiang Kai-shek announced the restoration of his "president" position in Taiwan.

29. In 1953, the "Election Law of the People's Republic of China for the National People's Congress and Local People's Congresses at All Levels" was promulgated and implemented.

30. In 1954, the first true hydrogen bomb was successfully tested.

31. In 1954, Puerto Rican nationalists opened fire from the gallery of the US House of Representatives, wounding five congressmen.

32. In 1955, the second set of RMB was issued nationwide.

33. In 1955, the Central Committee of the Communist Party of China issued the "Instruction on Publicizing Materialist Ideology and Criticizing Bourgeois Idealist Ideology".

34. In 1957, the Chinese Academy of Agricultural Sciences was founded.

35. In 1958, the PLA Academy of Military Sciences opened.

36. In 1961, President Kennedy established the Peace Corps.

37. In 1962, Uganda, the last British colony in North Africa, achieved internal self-government.

38. In 1977, the Central Committee of the Communist Party of China decided to establish the Editorial Committee for Chairman Mao Zedong's Works.

39. In 1979, the State Council decided to raise the purchase prices of 18 major agricultural and sideline products such as grain, oil and pigs from March.

40. In 1982, the first "Civilization and Courtesy Month" activity was carried out nationwide.

41. In 1982, People's Daily announced the State Council's implementation measures for the national voluntary tree-planting campaign.

42. In 1982, the Soviet Union's Venera 13 interplanetary station reached Venus, and its descent vehicle successfully made a soft landing on the surface of Venus.

43. In 1983, the "Trademark Law of the People's Republic of China" came into effect.

44. In 1983, the "Marine Environmental Protection Law of the People's Republic of China" took effect.

45. In 1996, the album Dong Biwu was published.

46. In 1996, Li Peng delivered a speech at the Asia-Europe Meeting.

47. In 1997, the Fifth Session of the Eighth National People's Congress was held in Beijing.

48. In 1999, Frank Bainimarama took office as Commander of the Fijian Armed Forces.

49. In 2006, the "Law of the People's Republic of China on Public Security Administration Punishments" and the "Notarization Law of the People's Republic of China" came into effect.

50. In 2013, Naw Kham, the main culprit of the Mekong River Massacre, was executed.