Researchers discovered that as many as 600 million birds die in the US every year after flying into skyscrapers.
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One of the world's most important medieval castles, Krak des Chevaliers, was conquered by Sultan Baibars.
German mathematician Carl Friedrich Gauss became the first person to prove quadratic reciprocity law.
Racer Bob Burman died after crashing his race car in Corona, California.
Construction of the Bahrain World Trade Center was officially completed.
The first idea of a fire escape was patented.
