DNA Unlocked: Watson and Crick Reveal Double Helix
James Watson and Francis Crick unveiled a double-helix model of DNA based on Rosalind Franklin's X-ray diffraction data, instantly unlocking the mechanism for how life stores and replicates genetic information. This breakthrough birthed molecular biology by revealing that DNA bases pair in specific triplets, a discovery that allowed scientists to decipher the entire genetic code within just five years.
February 28, 1953
73 years ago
Key Figures & Places
What Else Happened on February 28
Liu Bang crowned himself Emperor Gaozu at Luoyang, establishing a dynasty that would govern China for four centuries and define its cultural identity. This cons…
Liu Bang ascended the throne as Emperor Gaozu, unifying China after the chaotic collapse of the Qin dynasty. By establishing the Han dynasty, he institutionaliz…
Kavadh II ordered the execution of his father, Khosrau II, ending the reign of the last great Sasanian King of Kings. This regicide shattered the stability of t…
The Fourth Council of Constantinople closed after ten sessions. It had one job: decide whether Photius or Ignatius was the legitimate Patriarch of Constantinopl…
Ferdinand III of Castile secured the surrender of Jaén, dismantling the last major defensive stronghold protecting the Nasrid Kingdom of Granada. This victory f…
Hernán Cortés's forces execute the last Aztec emperor, Cuauhtémoc, to crush any lingering hope of indigenous resistance. This brutal elimination shatters the fi…
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