1893
ID: 366
Frege publishes Volume 1 of 'Grundgesetze der Arithmetik', attempting to derive arithmetic from pure logic
ID: 366
1893
ID: 1110
Alfred Ploetz publishes The Fitness of Our Race, founding German racial hygiene movement
ID: 1110
1893
ID: 1111
Henri Poincare develops systematic algebraic topology - creates fundamental group theory and homology
ID: 1111
1893
ID: 1112
Disease germ detection in milk begins
ID: 1112
1893
ID: 1113
Mold (vaccinated): 3,614 deaths per million vs Leicester (unvaccinated): 144 deaths per million
ID: 1113
1893
ID: 4269
Edwin Seibels invents vertical filing system - replaces horizontal pigeonholes and bound ledgers with standing folders
ID: 4269
1893
ID: 4470
Otto Steiger designs 'Millionaire' calculator - first commercially successful direct multiplication machine
ID: 4470
1893
ID: 5681
Tomato declared legally vegetable by U.S. Supreme Court - Nix v. Hedden case about tariffs, though botanically fruit
ID: 5681
1893
ID: 1109
November 18, 1893
Pope Leo XIII issues Providentissimus Deus on study of Holy Scripture - all books written by Holy Ghost
ID: 1109