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Branch of philosophy that seeks to determine the correct application of moral notions such as good and bad and right and wrong or a theory of the application or nature of such notions. Ethics is traditionally subdivided into normative ethics, metaethics, and applied ethics. Normative ethics seeks to establish norms or standards of conduct; a crucial question in this field is whether actions are to be judged right or wrong based on their consequences or based on their conformity to some moral rule, such as Do not tell a lie. Theories that adopt the former basis of judgment are called consequentialist (see consequentialism); those that adopt the latter are known as deontological (see deontological ethics). Metaethics is concerned with the nature of ethical judgments and theories. Since the beginning of the 20th century, much work in metaethics has focused on the logical and semantic aspects of moral language. Some major metaethical theories are naturalism (see naturalistic fallacy), intuitionism, emotivism, and prescriptivism. Applied ethics, as the name implies, consists of the application of normative ethical theories to practical moral problems (e.g., abortion). Among the major fields of applied ethics are bioethics, business ethics, legal ethics, and medical ethics.
Evolution of modern human beings from extinct nonhuman and humanlike forms. Genetic evidence points to an evolutionary divergence between the lineages of humans and the great apes on the African continent 85 million years ago (mya). The earliest fossils considered to be remains of hominins (members of the human lineage) date to at least 4 mya in Africa; they include the genus Australopithecus and other forms. The next major evolutionary stage, Homo habilis, inhabited sub-Saharan Africa about 21.5 mya. Homo habilis appears to have been supplanted by a taller and more humanlike species, Homo erectus, which lived from c. 1,700,000 to 200,000 years ago, gradually migrating into Asia and parts of Europe. Between c. 600,000 and 200,000 years ago, Homo heidelbergensis, sometimes called archaic Homo sapiens, lived in Africa, Europe, and perhaps parts of Asia. Having features resembling those of both H. erectus and modern humans, H. heidelbergensis may have been an ancestor of modern humans and also of the Neanderthals (H. neanderthalensis), who inhabited Europe and western Asia from c. 200,000 to 28,000 years ago. Fully modern humans (H. sapiens) seem to have emerged in Africa only c. 150,000 years ago, perhaps having descended directly from H. erectus or from an intermediate species such as H. heidelbergensis.
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| ... to live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them |
