Shapur I became co-emperor of the Sasanian Empire with his father Ardashir I.
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Project Starshot was announced by Yuri Milner, Stephen Hawking, and Mark Zuckerberg.
Hillary Clinton announced her candidacy for US President.
The 'Twentieth Century Dinosaurs' exhibit opened at the Smithsonian Institution Museum of Natural History.
Rock Around The Clock by Bill Haley and His Comets was recorded.
The world's first person visited space.
