Ask the Chatbot Games & Quizzes ProCon History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
Otto Köhler
Directory
References
Discover
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.
Where Do Anti-Semitic Conspiracy Theories About the Rothschild Family Come From?
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?
Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway
Flags That Look Alike
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.
Why Is It Called Black Friday?

Otto Köhler

German industrial psychologist

Learn about this topic in these articles:

Köhler effect

  • In Köhler effect: Discovery

    …by the German industrial psychologist Otto Köhler in the 1920s. He asked members of a Berlin rowing club to perform a difficult task: to do standing curls with a heavy weight—97 pounds (44 kg)—until they were so exhausted that they could not go on. Sometimes they did this alone, and…

    Read More