His pedagogical thinking has influenced many educators, such as JohannHeinrich Pestalozzi, Friedrich Wilhelm August Froebel, John Dewey and so on.
他的这一教育思想影响到了后来的裴斯泰洛齐、福禄贝尔、杜威等一大批教育家。
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More importantly, until JohannHeinrich von Thünen's The Isolated State in 1826, economists did not develop explicit and abstract models for behavior in order to apply the tools of mathematics.
The first permanent photograph was made in 1826 by Joseph Nicéphore Niépce, building on a discovery by JohannHeinrich Schultz (1724): a silver and chalk mixture darkens under exposure to light.