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![Germ Theory](https://www.worldhistory.org/img/c/p/360x202/17667.jpg?v=1714361343)
Definition
Germ Theory
The germ theory, which emerged in the late 19th century, demonstrated that microscopic germs caused most human infectious diseases. The germs involved included bacteria, viruses, fungi, protozoa, and prions. Louis Pasteur (1822-1895), a French...
![Greek vases: names, shapes and functions](https://www.worldhistory.org/img/c/p/360x202/1207.jpg?v=1707677764)
Article
Greek vases: names, shapes and functions
The system of names used today for Greek vases has quite rightly been described by one leading scholar as 'chaotic'. Many of the names were first applied in the eighteenth and nineteenth centuries by scholars who tried to fit the names of...
![The Value of Family in Ancient Greek Literature](https://www.worldhistory.org/img/c/p/360x202/5066.jpg?v=1644558302)
Article
The Value of Family in Ancient Greek Literature
When looking at Ancient Greek literature, one can see the importance family plays in Greek culture. We see this displayed in the Greek works Medea by Euripides and Antigone by Sophocles. Throughout these literary works we see that family...
![The Horse-rider Theory in Ancient Japan](https://www.worldhistory.org/img/c/p/360x202/5820.jpg?v=1705612744)
Article
The Horse-rider Theory in Ancient Japan
The 'horse-rider theory' is a controversial proposal that Japan was conquered around the 4th or 5th century CE by a culture from northern Asia to whom the horse was especially important. Although archaeological evidence and genetics point...
![Approximation to the Value of Square Root of 2](https://www.worldhistory.org/img/c/p/360x202/1432.jpg?v=1705245789)
Image
Approximation to the Value of Square Root of 2
This is one of the best methods of approximation to the value of square root of 2 used by the Pythagorean brotherhood.
![Distribution of Assignats](https://www.worldhistory.org/img/c/p/360x202/16175.jpg?v=1658405182)
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Distribution of Assignats
Distribution of Assignats, drawing by E. BeĢricourt, c. 1793.
National Library of France.
![The Distribution of Kites](https://www.worldhistory.org/img/c/p/360x202/3239.jpg?v=1600180202)
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The Distribution of Kites
The geographical distribution of desert kites (updated June 2020 CE).
![Distribution of Barley Rations Tablet from Girsu](https://www.worldhistory.org/img/c/p/360x202/4853.jpg?v=1600758003)
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Distribution of Barley Rations Tablet from Girsu
Adult workers received standard rations of 30 to 40 pints of barley per month while children received 20; the barley was distributed as rations to about 200 workmen and their children. This scribe was clearly highly trained in this art. From...
![The Theory of Omens](https://www.worldhistory.org/img/c/p/360x202/6976.jpg?v=1618577105)
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The Theory of Omens
On this clay tablet, the author has listed the titles of cuneiform omen collections drawn from celestial and terrestrial phenomena. Rather unusually, he explains that the validity of an individual omen depends on the particular month and...
![Geometric-Algebraic Theory Clay Tablet from Tell al-Dhabba'i](https://www.worldhistory.org/img/c/p/360x202/10795.jpg?v=1601541904)
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Geometric-Algebraic Theory Clay Tablet from Tell al-Dhabba'i
This clay tablet narrates a geometric-algebraic theory of how to make a solution for a mathematical problem. The conclusion applies a theory very similar to the Pythagorean theorem. From Tell Tell al-Dhabba'i, Iraq. Old-Babylonian period...