1872
ID: 982
Heinrich Schliemann begins excavations of Troy, funded partly by Prussian patronage
ID: 982
1872
ID: 983
Kulturkampf: Bismarck's conflict with Catholic Church over state control of education
ID: 983
1872
ID: 984
Bismarck bans Social Democratic Party while introducing social insurance
ID: 984
1872
ID: 985
Felix Klein publishes Erlangen Program defining geometry through group theory
ID: 985
1872
ID: 986
Richard Dedekind develops theory of algebraic integers - systematic study of number fields
ID: 986
1872
ID: 987
Boston experiences worst epidemic since vaccination began - 1,040 deaths
ID: 987
1872
ID: 988
Japan begins compulsory vaccination
ID: 988
1872
ID: 989
Nietzsche's Birth of Tragedy - Apollonian vs Dionysian, life justified only as aesthetic phenomenon
ID: 989
1872
ID: 4465
Frank Baldwin patents pinwheel calculator in America - improves on European designs with variable-toothed gear
ID: 4465