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  2. craigslist - Wikipedia

    en.wikipedia.org/wiki/Craigslist

    Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...

  3. Mat (gymnastics) - Wikipedia

    en.wikipedia.org/wiki/Mat_(gymnastics)

    In most cases – like in gymnastics – multiple mats are purchased to be strung together via velcro to create the ultimate sure-footed tumbling experience. Generally, mats used for gymnasiums and gymnastics mats come in 2-foot-wide panels, which is why many in the industry call them folding panel mats or folding mats.

  4. Fitness landscape - Wikipedia

    en.wikipedia.org/wiki/Fitness_landscape

    The idea of a fitness landscape is a metaphor to help explain flawed forms in evolution by natural selection, including exploits and glitches in animals like their reactions to supernormal stimuli. The idea of studying evolution by visualizing the distribution of fitness values as a kind of landscape was first introduced by Sewall Wright in ...

  5. Selection gradient - Wikipedia

    en.wikipedia.org/wiki/Selection_gradient

    The first and most common function to estimate fitness of a trait is linear ω =α +βz, which represents directional selection. [1] [10] The slope of the linear regression line (β) is the selection gradient, ω is the fitness of a trait value z, and α is the y-intercept of the fitness function.

  6. Artificial turf - Wikipedia

    en.wikipedia.org/wiki/Artificial_turf

    Artificial turf with rubber crumb infill Side view of artificial turf Diagram of the structure of modern artificial turf Artificial turf square mats. Artificial turf is a surface of synthetic fibers made to look like natural grass, used in sports arenas, residential lawns and commercial applications that traditionally use grass.

  7. Differential fitness - Wikipedia

    en.wikipedia.org/wiki/Differential_Fitness

    Differential fitness is the third of Darwin's four postulates for natural selection. It states that survival and reproduction rates vary between individuals. Fitness differentials are widespread and detectable throughout nature. This fitness differential is visible in several ways, and it can be detected throughout nature.

  8. Natural selection - Wikipedia

    en.wikipedia.org/wiki/Natural_selection

    The concept of fitness is central to natural selection. In broad terms, individuals that are more "fit" have better potential for survival, as in the well-known phrase "survival of the fittest", but the precise meaning of the term is much more subtle. Modern evolutionary theory defines fitness not by how long an organism lives, but by how ...

  9. Mat - Wikipedia

    en.wikipedia.org/wiki/Mat

    A place mat or serving mat is a flat piece of fabric or other type of material used on a table at the points at which dishes and plates will be located during a meal. One of the common purposes of such mats is to provide a thermal and physical barrier between that which is placed on the table, and the table itself—for instance, to stop hot ...