April 25: Red Hat Society Day; Feast day of Mark the Evangelist (Christianity); Anzac Day in Australia and New Zealand (1915); Liberation Day in Italy; Elbe Day in Russia and the United States (1945)
The double helix structure of DNA
- 775 – Forces of the Abbasid Caliphate crushed those of rebelling Armenian princes in the Battle of Bagrevand
- 1644 – The Ming dynasty of China fell when the Chongzhen Emperor committed suicide during a peasant rebellion led by Li Zicheng.
- 1846 – An open conflict between the military forces of the United States and Mexico began over the disputed border of Texas north of the Rio Grande and south of the Nueces River, later serving as a primary justification for Mexican–American War.
- 1953 – "Molecular Structure of Nucleic Acids" by molecular biologists James Watson and Francis Crick was first published in the scientific journal Nature, describing the discovery of the double helix structure (pictured) of DNA.
- 1986 – Mswati III was crowned King of Swaziland, succeeding his father Sobhuza II.
- More anniversaries:
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