Curie Isolates Radium: The Age of Radioactivity Begins
Marie and Pierre Curie isolated a new element from pitchblende that emitted carmine spectral lines never before documented, proving their sample contained something far more radioactive than uranium. They named this substance radium after its ability to emit energy as rays, a discovery that fundamentally expanded the understanding of atomic physics and launched the field of radioactivity research.
April 20, 1902
124 years ago
Key Figures & Places
What Else Happened on April 20
A mother and son fought over Jerusalem, not for glory, but for who held the reins of power. For eight years, Baldwin III and Queen Melisende clashed, tearing th…
Pope Boniface VIII issued the papal bull In Supremae Praeminentia Dignitatis to establish the Sapienza University of Rome. By centralizing ecclesiastical educat…
Three Genoese galleys smashed through the massive Ottoman blockade to deliver vital supplies and reinforcements to Constantinople. This tactical victory briefly…
Jacques Cartier departed Saint-Malo with two ships, sailing across the Atlantic to map the Gulf of St. Lawrence. By claiming these lands for France, he initiate…
A ghostly halo split the sky over Stockholm, three suns burning where only one should be. The crowd didn't just stare; they panicked, convinced the apocalypse h…
He kicked the door open, grabbed his hat, and told them to pack their bags. Cromwell didn't just dissolve the Rump Parliament; he dragged away the few MPs who s…
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