1909
ID: 1182
Saul Alinsky born
ID: 1182
1909
ID: 1183
16th Amendment to US Constitution ratified: Allowing federal income tax - Previously, most federal revenue came from tariffs; now complex tax calculations become essential
ID: 1183
1909
ID: 1184
Luitzen Brouwer develops systematic topology theory - Creates fixed-point theorems and topological methods
ID: 1184
1909
ID: 1185
Leo Baekeland patents Bakelite, the first fully synthetic plastic and thermosetting polymer
ID: 1185
1909
ID: 1186
Chicago first compulsory pasteurization ordinance
ID: 1186
1909
ID: 1187
England vaccination coverage drops to 40%
ID: 1187
1909
ID: 1188
Senator Money: Vaccination 'gives them the foot-and-mouth disease'
ID: 1188
1909
ID: 4277
Rand Kardex develops visible index system - cards with protruding tabs for quick reference without pulling files
ID: 4277
1909
ID: 4590
Planck's first wife Marie dies of tuberculosis - mother of his four children
ID: 4590
1909
ID: 1181
May 1909
Lenin states: Marxism is 'absolutely atheistic and positively hostile to all religion... We must combat religion—that is the ABC of all materialism.'
ID: 1181