Deutsch
Français
Italiano
Portuguese
1 · Religion and Magic
2 · Nature
3 · Human Being, Man in General
4 · Society, Civilization, Culture
5 · Abstract Ideas and Concepts
6 · History
7 · Bible
8 · Literature
9 · Classical Mythology and Ancient History
Top
4 · Society, Civilization, Culture
49 · education, science and learning
49E · science and technology
49E2 · physics and mechanics
49E22 · mechanics
49E221 · dynamics, kinetics
49E2211 · work, friction ~ mechanics