#OnThisDay #ProjectTiger, a tiger conservation programme, was launched by Govt of India (1973).

Samuel Morey is issued the first U.S. patent for an internal-combustion #Engine (1826).

#BigBang theory proposed in Physical Review by Alpher, Bethe & Gamow (1948).

Birth Anniversary of Otto von Bismarck (1815) - first #Chancellor of the German Empire between 1871 and 1890.

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