1901
Communication
Atlantic
Transatlantic radio
Marconi receives a wireless signal across the Atlantic.
Why it mattered
Communication without any physical connection at all.
Modern Era
1901
2 recorded milestones at this point in the record.
1901
Medicine
Austria
Blood groups discovered
Karl Landsteiner identified the ABO system and why some transfusions kill.
Why it mattered
Made blood transfusion safe and routine.
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