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How many balls are there?

Correct answers: 73

The first user who solved this task is Jasmina Atarac-Pantelic.

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Christopher Hansteen

Died 15 Apr 1873 at age 88 (born 26 Sep 1784).Norwegian astronomer and physicist who is noted for his research in geomagnetism. In 1701, Edmond Halley had already published a map of magnetic declinations, and the subject was studied by Humboldt, de Borda, and Gay-Lussac, among others. Hansteen collected available data and also mounted an expedition to Siberia, where he took many measurements for an atlas of magnetic strength and declination.

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