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March 20
ON THIS DAY

March 20

4 moments across history

1969

Concorde Makes Its First Supersonic Flight

Concorde Makes Its First Supersonic Flight

Concorde prototype on the runway before its historic supersonic test

Concorde Makes Its First Supersonic Flight — detail

Concorde breaking the sound barrier during its first supersonic flight

The Anglo-French supersonic passenger jet Concorde broke the sound barrier for the first time during a test flight over France, reaching Mach 1. The aircraft represented a triumph of engineering collaboration between Britain and France and would go on to carry passengers across the Atlantic in under 3.5 hours — less than half the time of conventional jets. Concorde entered commercial service in 1976 and flew until its retirement in 2003.

1995

Aum Shinrikyo Carries Out Tokyo Subway Sarin Attack

Aum Shinrikyo Carries Out Tokyo Subway Sarin Attack

Emergency responders at Kasumigaseki station following the sarin attack

Aum Shinrikyo Carries Out Tokyo Subway Sarin Attack — detail

Victims receiving treatment outside Tokyo subway stations

Members of the Japanese doomsday cult Aum Shinrikyo released sarin nerve agent on five lines of the Tokyo Metro during the morning rush hour, killing 13 people and injuring nearly 1,000. It was one of the most deadly terrorist attacks in Japan's history and the first large-scale use of a chemical weapon by a non-state actor. The attack prompted major changes to Japan's anti-terrorism laws and emergency response capabilities.

1852

Harriet Beecher Stowe Publishes Uncle Tom's Cabin

Harriet Beecher Stowe Publishes Uncle Tom's Cabin

First edition printing of Uncle Tom's Cabin, 1852

Harriet Beecher Stowe Publishes Uncle Tom's Cabin — detail

Harriet Beecher Stowe, author whose novel galvanized the abolitionist movement

Harriet Beecher Stowe's anti-slavery novel Uncle Tom's Cabin was published as a book after being serialized in the abolitionist newspaper The National Era. The novel depicted the harsh realities of slavery in the American South and became a cultural sensation — selling 300,000 copies in its first year. Abraham Lincoln reportedly greeted Stowe with the words "So you are the little woman who wrote the book that started this great war," referring to the Civil War.