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History of bloodThe history of blood is a fascinating journey from ancient mysticism to high-tech molecular biology. For centuries, humans knew blood was the "essence of life," but we had absolutely no idea how it actually worked.Here is a breakdown of how our understanding of the "red stuff" evolved.1. Ancient Myths and Vital SpiritsIn ancient times, blood wasn't just biology; it was soul.The Four Humors: The Greeks (notably Galen) believed blood was one of four bodily fluids that determined your health and personality.The "Liver" Theory: For over 1,000 years, people believed the liver constantly created new blood from food, which