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Found him. He was Justus Friedrich Carl Hecker (1795 – 1850), doctor and professor at the Frederick William University in Berlin. His essay on the plague was "Der schwarze Tod im vierzehnten Jahrhundert: Nach den Quellen für Ärzte und gebildete Nichtärzte bearbeitet." According to the Wikipedia he is the founder of the study of the history of disease. Note ...


Rice is three to five times more productive than wheat. The land can sustain two or three crops of rice annually, while wheat is limited to one. So, all factors combined, rice can be up to 15 times more productive. The same quantity of land can produce up to 15 times more rice than wheat. It is worth remembering that in early China, the available primitive ...

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