Psychology
1910
% complete
Airplanes used in war
1914
% complete
Trench Warfare
1914
% complete
Theory of relativity
1915
% complete
Tanks used in war
1916
% complete
Influenza Pandemic
1918
% complete
Big Bang Theory
1927
% complete
Quantum mechanics
1927
% complete
Rape of Nanjing
1937
% complete
Firebombing
1939
% complete
Green Revolution
1940 - 1968
% complete
Antibiotics
1942
% complete
Atomic bombs used in war
1945
% complete
Bombing of Hiroshima
1945
% complete
Dresden Bombing
1945
% complete
Polio Vaccine
1952
% complete
Artificial Heart
1982
% complete
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