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    Life

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    • Artificial life

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    • Births by year

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    • Death

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    • Extraterrestrial life

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    • Fictional life forms

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    • Hypothetical life forms

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    • Life in space

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    • Organisms

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    • Philosophy of life

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    • Prehistoric life

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    • Reproduction

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    • Life sciences

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    • Taxonomic categories

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    • Tree of life (biology)

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    • Life

    • Life

      Life on Earth: Life is a characteristic distinguishing physical entities having biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as . Various forms of life exist, such as ... Read »


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    • Biological organisation

    • Biological organisation is the hierarchy of complex biological structures and systems that define life using a reductionistic approach. The traditional hierarchy, as detailed below, extends from atoms to biospheres. The higher levels of this scheme are often referred to as a ecological organisation concept, or as the f ... Read »


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    • Biomedical cybernetics

    • Biomedical cybernetics investigates signal processing, decision making and control structures in living organisms. Applications of this research field are in biology, ecology and health sciences. ... Read »


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    • Birth

    • Birth, also known as parturition, is the act or process of bearing or bringing forth offspring. In mammals, the process is initiated by hormones which cause the muscular walls of the uterus to contract, expelling the fetus at a developmental stage when it is ready to feed and breathe. In some species the offspring is p ... Read »


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    • Carbon-based life

    • Carbon is a key component of all known life on Earth. Complex molecules are made up of carbon bonded with other elements, especially oxygen, hydrogen and nitrogen, and carbon can bond with all of these because of its four valence electrons. Carbon is abundant on Earth. It is also lightweight and relatively small in siz ... Read »


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    • Chirality

    • Chirality /kaɪˈrælɪtiː/ is a property of asymmetry important in several branches of science. The word chirality is derived from the Greek, χειρ (kheir), "hand", a familiar chiral object. An object or a system is chiral if it is distinguishable from its mirror image; that is, it cannot be on ... Read »


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    • Chirality (chemistry)

    • Chirality /kaɪˈrælɪti/ is a geometric property of some molecules and ions. A chiral molecule/ion is non-superposable on its mirror image. The presence of an asymmetric carbon center is one of several structural features that induce chirality in organic and inorganic molecules. The term chirality is derived ... Read »


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    • Coleridge's theory of life


    • Homochirality

    • Homochirality describes a geometric property of some materials that are composed of chiral units. Chiral bodies are objects which are non-superposable on their mirror images. For example, left and right hands are chiral. A substance is said to be homochiral if all the constituent units are molecules of the same chiral ... Read »


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    • Immortality

    • Immortality is eternal life, the ability to live forever. At least one species has potential biological immortality: Turritopsis dohrnii. Certain scientists, futurists, and philosophers have theorized about the immortality of the human body, with some suggesting that human immortality may be achievable in the first fe ... Read »


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    • Living systems

    • Living systems are open self-organizing living things that interact with their environment. These systems are maintained by flows of information, energy and matter. Some scientists have proposed in the last few decades that a general living systems theory is required to explain the nature of life. Such a general theor ... Read »


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    • Meaning of life

    • The meaning of life, or the answer to the question "What is the meaning of life?", pertains to the significance of living or existence in general. Many other related questions include "Why are we here?", "What is life all about?", or "What is the purpose of existence?" There have been a large number of proposed answers ... Read »


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    • Non-cellular life

    • Non-cellular 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 a living organism must be composed of one or more cells, but this is no longer considered necessary, and modern criteria allow for forms of life ba ... Read »


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    • Personal experience

    • Personal experience of a human being is the moment-to-moment experience and sensory awareness of internal and external events or a sum of experiences forming an empirical unity such as a period of life. An early belief of some philosophers of Ancient Greece was that the mind was like a recording device and simply kept ... Read »


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    • The Seven Pillars of Life

    • The Seven Pillars of Life are the essential principles of life described by Daniel E. Koshland in 2002 in order to create a universal definition of life. One stated goal of this universal definition is to aid in understanding and identifying artificial and extraterrestrial life. The seven pillars are Program, Improvisa ... Read »


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    • Value of life

    • The value of life, potency of life, or cost of life is an economic value assigned to life in general, or to specific living organisms. In social and political sciences, it is the marginal cost of death prevention in a certain class of circumstances. In many studies the value also includes the quality of life, the expec ... Read »


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  • What Else?

    • Life

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