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  2. Lists of problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_problems

    The following articles contain lists of problems: List of philosophical problems; List of undecidable problems; Lists of unsolved problems; List of NP-complete problems;

  3. List of undecidable problems - Wikipedia

    en.wikipedia.org/wiki/List_of_undecidable_problems

    The problem of planning air travel from one destination to another, when fares are taken into account. [ 15 ] In the ray tracing problem for a 3-dimensional system of reflective or refractive objects, determining if a ray beginning at a given position and direction eventually reaches a certain point.

  4. Lists of unsolved problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_unsolved_problems

    List of unsolved problems may refer to several notable conjectures or open problems in various academic fields: Natural sciences, engineering and medicine

  5. Wikipedia:Things that should not be surprising - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Things_that...

    Naked people exist, and might be used to illustrate an article about, say, nudism. Any page will never be 100% correct (except List of Pokémon characters).; Articles about ongoing ethnic feuds are subject to ongoing feuds between ethnic groups.

  6. List of phobias - Wikipedia

    en.wikipedia.org/wiki/List_of_phobias

    The English suffixes -phobia, -phobic, -phobe (from Greek φόβος phobos, "fear") occur in technical usage in psychiatry to construct words that describe irrational, abnormal, unwarranted, persistent, or disabling fear as a mental disorder (e.g. agoraphobia), in chemistry to describe chemical aversions (e.g. hydrophobic), in biology to describe organisms that dislike certain conditions (e.g ...

  7. Opposite - Wikipedia

    en.wikipedia.org/wiki/Opposite

    The term antonym (and the related antonymy) is commonly taken to be synonymous with opposite, but antonym also has other more restricted meanings. Graded (or gradable) antonyms are word pairs whose meanings are opposite and which lie on a continuous spectrum (hot, cold).

  8. Travel website - Wikipedia

    en.wikipedia.org/wiki/Travel_website

    A travel website is a website that provides travel reviews, trip fares, or a combination of both. Over 1.5 billion people book travel per year, 70% of which is done online. Over 1.5 billion people book travel per year, 70% of which is done online.

  9. List of philosophical problems - Wikipedia

    en.wikipedia.org/wiki/List_of_philosophical_problems

    The mind–body problem is the problem of determining the relationship between the human body and the human mind. Philosophical positions on this question are generally predicated on either a reduction of one to the other, or a belief in the discrete coexistence of both.