April 21 in history: First movie projector demonstrated, swine flu vaccine trial begins and more
Authored By wionintern
Published: Apr 21, 2020, 03:51 IST | Updated: Apr 21, 2020, 03:51 IST
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1895
First movie projector 'Panopticon' is demonstrated in US.
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1930
Around 320 inmates die after being left unlocked at Ohio prision fire.
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1960
Brasilia becomes capital of Brazil.
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1975
Vietnam's President Thieu resigns under pressure.
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1976
Clinical trials of swine flu vaccine begins in Washington, DC.
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