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In the 18th and 19th centuries, scientists, influenced by Enlightenment philosophers, developed a system of categorizing things in nature, including humans.Although Carolus Linnaeus was the first to develop a biological classification system, it was German scientist Johann Blumenbach who first introduced a race-based classification of humans, which established a framework for analyzing race and racial differences for the next hundred years.

If you would like to be notified when your comment is published, please fill in your email address in the form below.When citing this entry, please also cite the original data source.The enigma of iron tools that predate the Iron Age has long puzzled archaeologists.The point is, the proportionate concentrations of metal in meteors do not exist on Earth. So if we found that a powerful pharaoh had a knife or gadget made of this atypical metal, we can conclude that his people hammered it for him from meteoric iron.Jambon points out that conveniently for ancient metallurgists, meteoric iron is already in a metal state, ready for use, while extracting iron from terrestrial requires smelting – the process of reduction, removing oxygen atoms bound to the metal.

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