вы будете смеяться... Production and trade in pine-derived tar was a major contributor in the economies of Northern Europe and Colonial America, particularly North Carolina.[citation needed] Its main use was in preserving wooden vessels against rot. The largest user was the Royal Navy. Demand for tar declined with the advent of iron and steel ships. (...)Producing tar from wood was known in ancient Greece, and has probably been used in Scandinavia since the Iron Age. http://en.wikipedia.org/wiki/Tar
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Production and trade in pine-derived tar was a major contributor in the economies of Northern Europe and Colonial America, particularly North Carolina.[citation needed] Its main use was in preserving wooden vessels against rot. The largest user was the Royal Navy. Demand for tar declined with the advent of iron and steel ships. (...)Producing tar from wood was known in ancient Greece, and has probably been used in Scandinavia since the Iron Age.
http://en.wikipedia.org/wiki/Tar
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"Основной закон органической химии" (http://www.anekdot.ru/id/291989).
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