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How many different squares c...

How many different squares can be found in the shape shown in the illustration?

Correct answers: 165

The first user who solved this task is Ilan Amity.

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In high school, two boys, two...

In high school, two boys, two friends (one Spanish and one American), were talking about the grades they received in their classes.
American boy: "You got an F in Spanish! How could that happen? Spanish is what you speak at home and stuff."
Spanish boy: "Probably the same way you got an F in English."

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Robert Koch

Died 27 May 1910 at age 66 (born 11 Dec 1843). (Heinrich Hermann) Robert Koch was a German physician, a founder of the science of bacteriology, who discovered the tubercle bacillus (1882) and the cholera bacillus (1883). He studied bubonic plague in Bombay (1897) and malaria and sleeping sickness in Africa. In addition Koch investigated tropical dysentery, and the Egyptian eye disease (trachoma), and typhus recurrens in tropical Africa. He also carried out work of exceptional importance concerning destructive tropical cattle diseases, such as rinderpest, Surra disease, Texas fever, coast fever in cattle and the trypanosome disease carried by the tsetse fly. He won the Nobel Prize for Physiology or Medicine in 1905, "for his investigations and discoveries in relation to tuberculosis."

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