Non-cellular life, or acellular life, is life that exists without a cellular structure for at least part of its life cycle. Historically, most (descriptive) definitions of life postulated that an organism must be composed of one or more cells, but this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements.The primary candidates for non-cellular life are viruses. Some biologists consider viruses to be organisms, but others do not. Their primary objection is that no known viruses are capable of autonomous reproduction: they must rely on cells to copy them.Engineers sometimes use the term "artificial life" to refer to software and robots inspired by biological processes, but these do not satisfy any biological definition of life. Viruses as non-cellular life The nature of viruses was unclear for many years following their discovery as pathogens. They were described as poisons or toxins at first, then as "infectious...

Nuclear transmutation is the conversion of one chemical element or an isotope into another chemical element. Nuclear transmutation occurs in any process where the number of protons or neutrons in the nucleus of an atom is changed. A transmutation can be achieved either by nuclear reactions (in which an outside particle reacts with a nucleus) or by radioactive decay, where no outside cause is needed. Natural transmutation by stellar nucleosynthesis in the past created most of the heavier chemical elements in the known existing universe, and continues to take place to this day, creating the vast majority of the most common elements in the universe, including helium, oxygen and carbon. Most stars carry out transmutation through fusion reactions involving hydrogen and helium, while much larger stars are also capable of fusing heavier elements up to iron late in their evolution. Elements heavier than iron, such as gold or lead, are created through elemental transmutations that can naturally occur in supernovae. One goal of alchemy, the transmutation of base substances into gold, is now known to be impossible by chemical means but possible by physical means...

In literary criticism, stream of consciousness is a narrative mode or method that attempts "to depict the multitudinous thoughts and feelings which pass through the mind" of a narrator. The term was coined by Daniel Oliver in 1840 in First Lines of Physiology: Designed for the Use of Students of Medicine, when he wrote, If we separate from this mingled and moving stream of consciousness, our sensations and volitions, which are constantly giving it a new direction, and suffer it to pursue its own spontaneous course, it will appear, upon examination, that this, instead of being wholly fortuitous and uncertain, is determined by certain fixed laws of thought, which are collectively termed the association of ideas. Better known, perhaps, is the 1855 usage by Alexander Bain in the first edition of The Senses and the Intellect, when he wrote, "The concurrence of Sensations in one common stream of consciousness–on the same cerebral highway–enables those of different senses to be associated as readily as the sensations of the same sense". But it is commonly credited to William...

Histology, also known as microscopic anatomy or microanatomy, is the branch of biology that studies the microscopic anatomy of biological tissues. Histology is the microscopic counterpart to gross anatomy, which looks at larger structures visible without a microscope. Although one may divide microscopic anatomy into organology, the study of organs, histology, the study of tissues, and cytology, the study of cells, modern usage places all of these topics under the field of histology. In medicine, histopathology is the branch of histology that includes the microscopic identification and study of diseased tissue. In the field of paleontology, the term paleohistology refers to the histology of fossil organisms. Biological tissues Animal tissue classification There are four basic types of animal tissues: muscle tissue, nervous tissue, connective tissue, and epithelial tissue. All animal tissues are considered to be subtypes of these four principal tissue...

Rendang ( REN-DUNG; Indonesian pronunciation: [rənˈdaŋ]) is a Minang dish originating from the Minangkabau region in West Sumatra, Indonesia. It has spread across Indonesian cuisine to the cuisines of neighbouring Southeast Asian countries such as Malaysia, Singapore, Brunei and the Philippines. Rendang is often described as a rich dish of meat — most commonly beef (rendang daging) — that has been slow cooked and braised in a coconut milk seasoned with a herb and spice mixture, until the liquids evaporate and the meat turns dark brown and tender, becoming caramelized and infused with rich flavours. As the signature dish of Minangkabau culture, rendang is traditionally served at ceremonial occasions to honour guests during festive events; such as wedding feasts and Lebaran or Hari Raya (Indonesian popular words for both Eid al-Fitr and Eid al-Adha). Rendang is...