For years, prospectors had walked b

For years, prospectors had walked by the white rocks, dripped hydrochloric acid on them, heard a hissing sound, and assumed it was pure limestone. But if you look closely, you can see that the cracks in the white rock, and in some places on the surface, are covered with a black skin. Further research reveals the rich deposits of manganese in Siberia. Every discovery is not accidental, but the result of a consistent combination of observation and practical knowledge.In terms of being observant, Lomonosov points to the other side of the problem. He is right: the theory should be determined from the phenomena, and then the observation should be modified by the theory.