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'''List of unsolved problems''' may refer to several notable [[List of conjectures|conjectures]] or [[open problem]]s in various academic fields: * [[List of unsolved problems in astronomy|Unsolved problems in astronomy]] ...

...speech, an '''instant''' has been defined as "a point or very short space of time," a notion deriving from its etymological source, the Latin verb ''ins ...uded by stating that ''instantaneous'' is, with respect to the measurement of time, mutually exclusive.<ref>{{Cite book |last=Stafford |first=John Willia ...

{{short description|Concept that there might be more than one dimension of time}} ...dimension of time''' has occasionally been discussed in [[physics]] and [[philosophy]]. Similar ideas appear in folklore and fantasy literature. ...

{{Short description|Studies of the nature of technology}} ...of technology''' is a sub-field of [[philosophy]] that studies the nature of [[technology]] and its social effects. ...

{{Short description|Used to describe characteristics of a phenomenon being studied}} ...natory research]]. For example, over time the periodic table's description of the elements allowed scientists to explain chemical reaction and make sound ...

{{about|the history of the scientific concept of energy|the history of how humans use energy|Energy }} ...the 4th century BCE works of [[Aristotle]] (OUP V, 240, 1991) (including ''Physics'', ''Metaphysics'', ''[[Nicomachean Ethics]]''<ref>[https://www.perseus.tuf ...

{{short description|Measure of particle positions within a system}} ...Gilson MK | title = Thermodynamic and Differential Entropy under a Change of Variables | journal = Entropy | volume = 12 | issue = 3 | pages = 578–590 | ...

{{short description|Active acquisition of information from a primary source}} ...be [[qualitative property|qualitative]], that is, the absence or presence of a property is noted and the observed phenomenon described, or [[quantitativ ...

{{Short description|Period of time occurring now}} {{About|the concept of current time|a gift|Gift|other uses|Present (disambiguation)}} ...

{{Short description|Proposition in philosophy of mind}} ...>{{cite journal |last=McGinn |first=Colin |year=1994 |title=The Problem of Philosophy |url=http://www.nyu.edu/gsas/dept/philo/courses/consciousness97/papers/Prob ...

{{Short description|Philosophical idea of things impossible to know}} ...'' know. Some related concepts include the [[halting problem]], the limits of knowledge, the unknown unknowns, and chaos theory. ...

...bar}}{{For|use in anatomy|Epiphyseal plate}}{{distinguish|Physis (journal)|Physics}} ...ntifical Academy of Sciences. ''Evolving Concepts of Nature''. Proceedings of the Plenary Session, 24–28 October 2014, Acta 23, Vatican City, 2015. [http ...

{{Short description|Concept in physics}} ...c circuit]], Hopkinson's law.<ref>Waygood, p. 137</ref> It is the property of certain substances or phenomena that give rise to [[magnetic fields]]: ...

{{short description|Philosophical theory regarding temporal ordering of events}} ...cite book |last= Craig|first= W. L.|date= 2000|title= The Tenseless Theory of Time: A Critical Examination|location= Dordrecht|publisher= Kluwer Academic ...

...meant the expertise needed to contribute fully to all aspects of a domain of activity. ...r physicist even though they can’t do plumbing or physics. It is this kind of expertise that Collins and Evans call interactional expertise. ...

part of the set of 830+ outlines listed at a special type of list article. ...

{{Short description|Law in Physics}} ...logram]] of forces''' is a method for solving (or visualizing) the results of applying two [[force]]s to an object. ...

O. Zajkov, Physics Institute, [[Ss. Cyril and Methodius University of Skopje]], Macedonia.</ref>)]] | title = Experiments on the effect of a current of electricity on the magnetic needles ...

...ientist, died 1795)|George Adams']] ''Lectures on Natural and Experimental Philosophy''.]] ...s.aip.org/aapt/ajp/article/69/1/50-55/1055596 |journal=American Journal of Physics |language=en |volume=69 |issue=1 |pages=50–55 |doi=10.1119/1.1313519 |bibco ...

...problems and [[Paradox|paradoxa]], and the related fundamental problems of philosophy and [[Epistemology|science]]. ...'''Περὶ τῶν ἀρεσκόντων φιλοσόφοις φυσικῶν δογμάτων,''' "Upon the Opinions of the Philosophers": ''"Αντιφών και Κριτόλαος νόημα ή μέτρον τον χρόνον, ουχ ...