Albinism in humans all vertebrates, including humans. It is due to absence or defect of tyrosinase, a copper-containing enzyme involved in the production of melanin. It is the opposite of melanism. Unlike humans, other animals have multiple pigments and for these, albinism is considered to be a hereditary condition characterised by the absence of melanin in particular, in the eyes, skin, hair, scales, feathers or cuticle. While an organism with complete absence of melanin is called an albino, an organism with only a diminished amount of melanin is described as leucistic or albinoid. The term is from the Latin "albus", "white". There are
What Is History? 19th century, western historians held to an empirical, positivist worldview that revolved around a "cult of facts", viewing historical facts as information that simply had to be assembled to produce an objective picture of the past that was entirely accurate and independent of any human opinion. Carr argues that this view is inherently flawed, because historians selectively choose which "facts of the past" get to become "historical facts", or information that the historians have decided is important. As an example, he notes that millions of humans have crossed the Rubicon river in Northeastern Italy, but that historians have only chosen