“The different thought-processes seem to differ chiefly in respect to their temporal rhythm. If plants have souls, then hours and days must be for them what seconds are for us. The corresponding period for the earth-soul, at least for its outward activity, possibly embraces many thousands of years.”

—  Bernhard Riemann

Gesammelte Mathematische Werke (1876)

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Bernhard Riemann 43
German mathematician 1826–1866

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