Democratic Senator Bernie Sanders dropped out of the race for US president.
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Clint Eastwood was elected as Mayor of Carmel, California.
The first person in the world to be diagnosed with Alzheimer's died.
Construction of the Bahrain World Trade Center was officially completed.
German mathematician Carl Friedrich Gauss became the first person to prove quadratic reciprocity law.
One of the world's most important medieval castles, Krak des Chevaliers, was conquered by Sultan Baibars.
