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| | next step to this fact game''s success is that it produces the impression that it''s a multi player game. I come to feel it''s a fantasy because you don''t do all that's necessary directly with the next player. You don''t fight and explore immediately like you would on the inside Wow, of play to prevent another player even during with a turn-by-turn justification comparable to Chess. Any time you raid another player''s village, which in turn player is offline plus you could at this particular same time just develop into raiding a random computer-generated village.<br><br>Occur a gaming program to deal with. Similar to [http://Www.Guardian.Co.uk/search?q=recommended+assignments recommended assignments] time, this video game program will benefit manage a child's customs. When the times have first been set, stick to specific schedule. Do Far from being back as a cause of whining or pleading with. The schedule is only sensible if you just follow-through.<br><br>For those who have little ones who enjoy video games, then conscious how challenging it really can be always to pull them out from the t. v.. Their eye can grow to be stuck towards the watch out for for hours as chances are they'll play their preferred social games. If you want aid regulating your children's clash of clans Hack time, then your pursuing article has some tips for you.<br><br>My husband and i are a group pertaining to coders that loves to assist you play Cof. People around the globe are continuously developing Cheats to speed up Levelling easily and to benefit from more gems for release. Without our hacks it is able to take you ages as a way to reach your level.<br><br>A website is offering Clash associated with Clans hack tool trainer to users who demand it. The website offering this tool is protected and it guarantees excellent quality software. There furthermore other sites which provides you with the tool. But ranks, which indicates either incomplete or connected with bad quality. When users download these somewhat hack tools, instead of performing well they end in mid-air in trouble. So, players are advised to choose the tool from a site that offers complete companies.Users who are finding it tough to cross the hurdles can locate a site that allows people download the cheats. Most of the businesses allow free download and websites charge fees. Users can locate an online site from where they can obtain good quality software.<br><br>That war abject is agnate in your approved village, except that your fights abject will not get resources. Barrio while in your warfare abject cannot be anon improved in addition rearranged, as it by it's self mimics this adjustment yet accomplished completed advancement amounts of your apple on alertness day. For those who have virtually any inquiries about where and how you can use clash of clans hack android ([http://circuspartypanama.com http://circuspartypanama.com]), it is possible to e-mail us on the web site. World war bases additionally never charge to take their accessories rearmed, defenses reloaded maybe characters healed, as they are consistently ready. The association alcazar around the your war abject ask be abounding alone concerned with the one in the whole village.<br><br>Typically individuals who produced this unique Crack Clash of The entire family are true fans having to do with the sport themselves, not to mention this is exactly what ensures the potency at our alternative, because experts needed to do it ourselves. |
| '''Anti-gravity''' is the idea of creating a place or object that is free from the force of [[gravity]]. It does not refer to the lack of weight under gravity experienced in [[free fall]] or [[orbit]], or to balancing the force of gravity with some other force, such as electromagnetism or aerodynamic lift. Anti-gravity is a recurring concept in science fiction, particularly in the context of [[spacecraft propulsion]]. An early example is the gravity blocking substance "[[Cavorite]]" in [[H. G. Wells]]' ''[[The First Men in the Moon]]''.
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| In [[Newton's law of universal gravitation]], gravity was an external force transmitted by unknown means. In the 20th century, Newton's model was replaced by [[general relativity]] where gravity is not a force but the result of the geometry of spacetime. Under general relativity, anti-gravity is impossible except under contrived circumstances.<ref>Peskin, M and Schroeder, D.; ''An Introduction to Quantum Field Theory'' (Westview Press, 1995) [ISBN 0-201-50397-2]</ref><ref>{{cite book | author = [[Robert M. Wald|Wald, Robert M.]]| title = ''[[General Relativity (book)|General Relativity]]'' | location = Chicago | publisher = University of Chicago Press | year = 1984 | isbn = 0-226-87033-2 }}</ref><ref>[[Joseph Polchinski|Polchinski, Joseph]] (1998). ''String Theory'', Cambridge University Press. A modern textbook</ref> [[Quantum physicist]]s have postulated the existence of [[gravitons]], a set of [[Mass in special relativity|massless]] [[elementary particles]] that transmit the force, and the possibility of creating or destroying these is unclear.
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| "Anti-gravity" is often used colloquially to refer to devices that look as if they reverse gravity even though they operate through other means, such as [[Ionocraft|lifters]], which fly in the air by using [[electromagnetic field]]s.<ref>{{cite news|url=http://www.wired.com/wired/archive/11.08/pwr_antigravity.html|accessdate=23 July 2010|first=Clive|last=Thompson|work=[[Wired Magazine|Wired]]|date=August 2003|title=The Antigravity Underground| archiveurl= http://web.archive.org/web/20100818230902/http://www.wired.com/wired/archive/11.08/pwr_antigravity.html| archivedate= 18 August 2010 <!--DASHBot-->| deadurl= no}}</ref><ref>{{cite web|url=http://paranormal.about.com/library/weekly/aa081902a.htm|title=On the Verge of Antigravity|publisher=[[About.com]]|accessdate=23 July 2010}}</ref>
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| ==Hypothetical solutions==
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| ===Gravity shields===
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| {{main|Gravitational shielding}}
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| In 1948 successful businessman [[Roger Babson]] (founder of [[Babson College]]) formed the [[Gravity Research Foundation]] to study ways to reduce the effects of gravity.<ref>Mooallem, J. (October 2007). A curious attraction. ''Harper's Magazine,'' '''315'''(1889), pp. 84–91.</ref> Their efforts were initially somewhat "[[crank (person)|crank]]ish", but they held occasional conferences that drew such people as [[Clarence Birdseye]] of frozen-food fame and [[Igor Sikorsky]], inventor of the helicopter. Over time the Foundation turned its attention away from trying to control gravity, to simply better understanding it. The Foundation disappeared some time after Babson's death in 1967. However, it continues to run an essay award, offering prizes of up to $5,000. As of 2013, it is still administered out of [[Wellesley, Massachusetts]], by George Rideout, Jr., son of the foundation's original director.<ref>[http://www.gravityresearchfoundation.org/winners_name.html#s List of winners]</ref> Recent winners include California astrophysicist [[George F. Smoot]], who later won the 2006 [[Nobel Prize in physics]].
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| ===General relativity research in the 1950s===
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| {{Main|United States gravity control propulsion research (1955–1974)}}
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| General relativity was introduced in the 1910s, but development of the theory was greatly slowed by a lack of suitable mathematical tools. Although it appeared that anti-gravity was outlawed under general relativity, there were a number of efforts to study potential solutions that allowed anti-gravity-type effects.
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| It is claimed the [[US Air Force]] also ran a study effort throughout the 1950s and into the 1960s.<ref>Goldberg, J. M. (1992). US air force support of general relativity: 1956–1972. In, J. Eisenstaedt & A. J. Kox (Ed.), ''Studies in the History of General Relativity, Volume 3'' Boston, Massachusetts: Center for Einstein Studies. ISBN 0-8176-3479-7</ref> Former Lieutenant Colonel [[Ansel Talbert]] wrote two series of newspaper articles claiming that most of the major aviation firms had started gravity control propulsion research in the 1950s. However there is little outside confirmation of these stories, and since they take place in the midst of the [[policy by press release]] era, it is not clear how much weight these stories should be given.
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| It is known that there were serious efforts underway at the [[Glenn L. Martin Company]], who formed the Research Institute for Advance Study.<ref>Mallan, L. (1958). ''Space satellites'' (How to book 364). Greenwich, CT: Fawcett Publications, pp. 9–10, 137, 139. LCCN 58-001060</ref><ref>Clarke, A. C. (December 1957). The conquest of gravity, ''Holiday'', '''22'''(6), 62</ref> Major newspapers announced the contract that had been made between theoretical physicist [[Burkhard Heim]] and the Glenn L. Martin Company. Other private sector efforts to master the understanding of gravitation was the creation of the Institute for Field Physics, [[University of North Carolina at Chapel Hill]] in 1956, by Gravity Research Foundation trustee, Agnew H. Bahnson.
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| Military support for anti-gravity projects was terminated by the [[Mansfield Amendment]] of 1973, which restricted [[United States Department of Defense|Department of Defense]] spending to only the areas of scientific research with explicit military applications. The Mansfield Amendment was passed specifically to end long-running projects that had little to show for their efforts.
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| Under the general relativity, gravity is the result of following spatial geometry (change in the normal shape of space) caused by local mass-energy. This theory holds that it is the altered shape of space, deformed by massive objects, that causes 'gravity', which is actually a property of deformed space rather than being a true force. Although the equations cannot produce a "negative geometry" normally, it is possible to do so using a "[[negative mass]]". The same equations do not, of themselves, rule out the existence of negative mass.
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| Both general relativity and Newtonian gravity appear to predict that negative mass would produce a repulsive gravitational field. In particular, Sir [[Hermann Bondi]] proposed in 1957 that negative gravitational mass, combined with negative inertial mass, would comply with the [[strong equivalence principle]] of general relativity theory and the Newtonian laws of conservation of linear momentum and energy. Bondi's proof yielded singularity free solutions for the relativity equations.<ref name="Bondi">Bondi, H. (July 1957). Negative mass in general relativity. ''Reviews of Modern Physics'', '''29'''(3), 423–428.</ref> In July 1988, [[Robert L. Forward]] presented a paper at the AIAA/ASME/SAE/ASEE 24th Joint Propulsion Conference that proposed a Bondi negative gravitational mass propulsion system.<ref name= "Forward">Forward, R. L. (1990, Jan.-Feb.), "Negative matter propulsion," ''Journal of Propulsion and Power'', '''Vol. 6''' (1), pp. 28–37; see also commentary Landis, G.A. (1991) "Comments on Negative Mass Propulsion," 'Journal of Propulsion and Power'', ''Vol. 7,'' No. 2, p. 304.</ref>
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| Every [[point mass]] attracts every other point mass by a [[force]] pointing along the [[line (mathematics)|line]] intersecting both points. The force is [[proportionality (mathematics)|proportional]] to the [[product (mathematics)|product]] of the two [[mass]]es and inversely proportional to the [[square (algebra)|square]] of the distance between the point masses:
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| :<math>\mathbf{F_{12}} = G \frac{(-m_1) m_2}{r^2}\mathbf{r_{12}} = G \frac{m_1 m_2}{r^2}\mathbf{r_{21}} = \mathbf{-F_{21}},</math>
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| where:
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| *''<math>F_{12}</math>'' is the magnitude of the gravitational force between the two point masses,
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| *''G'' is the [[gravitational constant]],
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| *|''m''<sub>1</sub>| >0 is the (negative) mass of the first point mass (the minus is put out to show negative force; ''m''<sub>1</sub> is actually <0),
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| *''m''<sub>2</sub> >0 is the mass of the second point mass,
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| *''r'' is the distance between the two point masses.
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| Note the similarity to the Newtonian equation of F=ma.
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| Bondi pointed out that a negative mass will fall toward (and not away from) "normal" matter, since although the gravitational force is repulsive, the negative mass (according to Newton's law, F=ma) responds by accelerating in the opposite of the direction of the force. Normal mass, on the other hand, will fall away from the negative matter. He noted that two identical masses, one positive and one negative, placed near each other will therefore self-accelerate in the direction of the line between them, with the negative mass chasing after the positive mass.<ref name="Bondi" /> Notice that because the negative mass acquires negative [[kinetic energy]], the total energy of the accelerating masses remains at zero. Forward pointed out that the self-acceleration effect is due to the negative inertial mass, and could be seen induced without the gravitational forces between the particles.<ref name="Forward" />
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| The [[Standard Model]] of particle physics, which describes all presently known forms of matter, does not include negative mass. Although cosmological [[dark matter]] may consist of particles outside the Standard Model whose nature is unknown, their mass is ostensibly known – since they were postulated from their gravitational effects on surrounding objects, which implies their mass is positive. (The proposed cosmological [[dark energy]], on the other hand, is more complicated, since according to general relativity the effects of both its energy density and its negative pressure contribute to its gravitational effect.)
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| ===Fifth force===
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| Under the general relativity any form of energy couples with spacetime to create the geometries that cause gravity. A longstanding question was whether or not these same equations applied to [[antimatter]]. The issue was considered solved in 1960 with the development of [[CPT symmetry]], which demonstrated that antimatter follows the same laws of physics as "normal" matter, and therefore has positive energy content and also causes (and reacts to) gravity like normal matter (see [[gravitational interaction of antimatter]]).
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| For much of the last quarter of the 20th century, the physics community was involved in attempts to produce a [[unified field theory]], a single physical theory that explains the four fundamental forces: gravity, electromagnetism, and the strong and weak nuclear forces. Scientists have made progress in [[grand unification theory|unifying the three quantum forces]], but gravity has remained "the problem" in every attempt. This has not stopped any number of such attempts from being made, however.
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| Generally these attempts tried to "quantize gravity" by positing a particle, the [[graviton]], that carried gravity in the same way that [[photon]]s (light) carry electromagnetism. Simple attempts along this direction all failed, however, leading to more complex examples that attempted to account for these problems. Two of these, [[supersymmetry]] and the relativity related [[supergravity]], both required the existence of an extremely weak "fifth force" carried by a [[graviphoton]], which coupled together several "loose ends" in quantum field theory, in an organized manner. As a side effect, both theories also all but required that antimatter be affected by this fifth force in a way similar to anti-gravity, dictating repulsion away from mass. Several experiments were carried out in the 1990s to measure this effect, but none yielded positive results.<ref name=SciAm79>''Supergravity and the Unification of the Laws of Physics,'' by Daniel Z. Freedman and Peter van Nieuwenhuizen, Scientific American, February 1978</ref>
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| ===General-relativistic "warp drives"===
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| There are solutions of the field equations of general relativity which describe "warp drives" (such as the [[Alcubierre metric]]) and stable, traversable [[wormholes]]. This by itself is not significant, since ''any'' spacetime geometry is a solution of the field equations for some configuration of the [[stress–energy tensor]] field (see [[exact solutions in general relativity]]). General relativity does not constrain the geometry of spacetime unless outside constraints are placed on the stress–energy tensor. Warp-drive and traversable-wormhole geometries are well-behaved in most areas, but require regions of [[exotic matter]]; thus they are excluded as solutions if the stress–energy tensor is limited to known forms of matter. Dark matter and dark energy are not understood enough at this present time to make general statements regarding their applicability to a warp-drive.
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| ===Breakthrough Propulsion Physics Program===
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| During the close of the twentieth century [[NASA]] provided funding for the [[Breakthrough Propulsion Physics Program]] (BPP) from 1996 through 2002. This program studied a number of "far out" designs for space propulsion that were not receiving funding through normal university or commercial channels. Anti-gravity-like concepts were investigated under the name "diametric drive". The work of the BPP program continues in the independent, non-NASA affiliated [[Tau Zero Foundation]].<ref>[http://www.tauzero.aero/ Tau Zero Foundation]</ref>
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| ==Empirical claims and commercial efforts==
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| There have been a number of attempts to build anti-gravity devices, and a small number of reports of anti-gravity-like effects in the scientific literature. None of the examples that follow are accepted as reproducible examples of anti-gravity.
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| ===Gyroscopic devices===
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| [[Image:H W Wallace force field figure 4.png|thumb|350px|A "kinemassic field" generator from {{US patent|3626605}}: Method and apparatus for generating a secondary gravitational force field.]]
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| [[Gyroscope]]s produce a force when twisted that operates "out of plane" and can appear to lift themselves against gravity. Although this force is well understood to be illusory, even under Newtonian models, it has nevertheless generated numerous claims of anti-gravity devices and any number of patented devices. None of these devices have ever been demonstrated to work under controlled conditions, and have often become the subject of [[conspiracy theories]] as a result. A famous example is that of Professor [[Eric Laithwaite]] of Imperial College, London, in the 1974 address to the Royal Institution.<ref>{{cite web|url=http://www.rexresearch.com/laithwat/laithw1.htm#art1|title=Eric LAITHWAITE Gyroscope Levitation|work=Rex research|publisher=rexresearch.com|accessdate=23 October 2010}}</ref>
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| Another "rotating device" example in shown a series of patents granted to Henry Wallace between 1968 and 1974. His devices consist of rapidly spinning disks of [[brass]], a material made up largely of elements with a total half-integer nuclear spin. He claimed that by rapidly rotating a disk of such material, the [[nuclear spin]] became aligned, and as a result created a "gravitomagnetic" field in a fashion similar to the magnetic field created by the [[Barnett effect]].<ref>{{US patent|3626606}}</ref><ref>{{US patent|3626605}}</ref><ref>{{US patent|3823570}}</ref> No independent testing or public demonstration of these devices are known.
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| In 1989, it was reported that a weight decreases along the axis of a right spinning gyroscope.<ref>{{cite journal|author=Hayasaka, H. and Takeuchi, S. |year=1989|url=http://link.aps.org/doi/10.1103/PhysRevLett.63.2701|work=[[Physics Review Letters]]|title=Anomalous weight reduction on a gyroscope’s right rotations around the vertical axis on the Earth|volume=63|issue=25|pages=2701–2704}}</ref> A test of this claim a year later yielded null results.<ref>{{cite journal|author=Nitschke, J. M., and Wilmath, P. A.|url=http://link.aps.org/doi/10.1103/PhysRevLett.64.2115|title=Null result for the weight change of a spinning gyroscope|year=1990|work=[[Physics Review Letters]]|volume=64| issue=18|pages=2115–2116|doi=10.1103/PhysRevLett.64.2115|doi=10.1103/PhysRevLett.63.2701|accessdate=January 5, 2014}}</ref> A recommendation was made at to conduct further tests at a 1999 AIP conference.<ref>{{cite journal|author=Iwanaga, N.|year=1999|title=Reviews of some field propulsion methods from the general relativistic standpoint|work=AIP Conference Proceedings|volume=458|pages=1015–1059}}.</ref>
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| ===Thomas Townsend Brown's gravitator===
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| {{see also|United States gravity control propulsion research#Brown's gravitator}}
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| During the 1920s [[Thomas Townsend Brown]], a high-voltage experimenter, produced a device he called the "gravitator" which he claimed used an unknown force to produce anti-gravity effects by applying high voltages to materials with high [[dielectric]] constants. Although it was claimed that the device operated independently of [[working mass]], and was denounced by critics on those grounds, Brown continued his work and produced a series of ever more successful high-voltage devices in the following years.{{Citation needed|date=July 2011}}
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| Regardless of those earlier criticisms, today the idea of [[field propulsion]] independent of reaction mass is gaining credibility.{{Citation needed|date=July 2011}} The [[Biefeld–Brown effect]] continues to fascinate those interested in better space propulsion technologies.<ref name="veritay">Veritay Technology, Inc., "21st-Century Propulsion Concept", DTIC AD-A237 853, Phillips Lab. PL-TR-91-3009, Contract Nr. F04611-89-C-0023; Approved for Public Release; Distr. Unlimited.</ref> A 1956 analysis by the Gravity Research Group and by an anonymous writer, under the pen name of Intel (1956), in the magazine Interavia, claimed the Biefeld–Brown effect, then being referred to as [[electrogravitics]],<ref>Kerstin Klasson, ''Developments in the Terminology of Physics and Technology''. Page 30.</ref> was the primary theory tested by the many aerospace firms studying gravity in the 1950s. However it should be noted that "Intel" was a pseudonym, and therefore may not be a reliable witness.
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| Electrogravitics and lifters are popular topics in [[ufology]]. Lifters require air ([[ion wind]]) and do not demonstrate new physics, however Brown specifically tested his asymmetrical capacitor devices in a vacuum and reported positive results. Moreover, experimenters with lifters generally try to minimize the mass, whereas Brown noted that both high mass density and high dielectric constant were factors in achieving higher performance from his "gravitators".<ref>http://www.thomastownsendbrown.com/forum/viewtopic.php?f=19&t=56</ref>
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| ===Gravitoelectric coupling===
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| In 1992, the Russian researcher [[Eugene Podkletnov]] claimed to have discovered, whilst experimenting with [[superconductor]]s, that a fast rotating superconductor reduces the gravitational effect. Many studies have attempted to reproduce Podkletnov's experiment, always to negative results.<ref>Li, N., Noever, D., Robertson, T., Koczor, R., and Brantley, W., "Static Test for a Gravitational Force Coupled to Type II YBCO Superconductors," Physica C, 281, 260–267, (1997).</ref><ref>Woods, C., Cooke, S., Helme, J., and Caldwell, C., "Gravity Modification by High Temperature Superconductors," Joint Propulsion Conference, AIAA 2001–3363, (2001).</ref><ref>Hathaway, G., Cleveland, B., and Bao, Y., "Gravity Modification Experiment using a Rotating Superconducting Disc and Radio Frequency Fields," Physica C, 385, 488–500, (2003).</ref><ref>Tajmar, M., and de Matos, C.J., "Gravitomagnetic Field of a Rotating Superconductor and of a Rotating Superfluid," Physica C, 385(4), 551–554, (2003).</ref>
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| In 1989, [[Ning Li]], of the [[University of Alabama in Huntsville]] proposed how a time dependent magnetic field could cause the spins of the lattice ions in a superconductor to generate detectable [[gravitomagnetic]] and gravitoelectric fields. In 1999, Li and her team appeared in ''[[Popular Mechanics]]'', claiming to have constructed a working [[prototype]] to generate what she described as "AC Gravity." No further evidence of this prototype has been offered.<ref>[http://www.popularmechanics.com/science/research/1281736.html Taming Gravity – Popular Mechanics<!-- bot-generated title -->] at www.popularmechanics.com{{dead link|date=January 2014}}</ref><ref>{{cite journal |url=http://www.highbeam.com/doc/1G1-65730414.html|title=Taming Gravity|publisher=HighBeam Reseatch|work=Popular Mechanics|date=October 1, 2000|first=Jim|last=Wilson|accessdate=January 5, 2014}}</ref><ref>{{cite web|url=http://www.light-science.com/gen2.html|title=Gravity Conquered?|last=Cain|first=Jeanette|publisher=light-science.com|accessdate=January 5, 2014}}</ref>
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| ===Recent efforts===
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| The [http://www.gravitation.org Institute for Gravity Research] of the Göde Scientific Foundation has tried to reproduce different experiments which allegedly show an antigravity effect. All attempts to observe an antigravity effect have been unsuccessful. The foundation has offered a reward of one million euros for a reproducible antigravity experiment.<ref>{{cite web|url=http://www.goede-stiftung.org/uk/institute-for-gravity-research/goede-award.html|title=The Göde reward for gravity research|publisher=Institute of Gravity Research|accessdate=January 2, 2014}}</ref>
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| ==Conventional effects that mimic anti-gravity effects==
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| * [[Magnetic levitation]] suspends an object against gravity by use of [[electromagnetism|electromagnetic]] forces. While visually impressive, gravitation itself functions normally in such devices. Various alleged anti-gravity devices may in reality work by [[electromagnetism]].
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| * A [[tidal force]] causes objects to move along diverging paths near a massive body (such as a [[planet]] or [[star]]), producing effects that seem like repulsion or disruptive forces when observed locally. This is not anti-gravity. In Newtonian mechanics, the tidal force is the effect of the larger object's gravitational force being different at the differing locations of the diverging bodies. Equivalently, in Einsteinian gravity, the tidal force is the effect of the diverging bodies following different paths in the negatively [[curvature|curved]] spacetime around the larger body.
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| * Large amounts of normal matter can be used to produce a gravitational field that compensates for the effects of another gravitational field, though the entire assembly will still be attracted to the source of the larger field. Physicist [[Robert Forward|Robert L. Forward]] proposed using lumps of [[degenerate matter]] to locally compensate for the tidal forces near a [[neutron star]].
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| * [[Ionocraft]], sometimes referred to as "Lifters", have been claimed to defy gravity, but in fact they use accelerated ions which have been stripped from the air around them to produce thrust. The thrust produced by one of these devices is not enough to lift its own power supply. Specifically, a special type of [[electrohydrodynamic thruster]] uses the Biefeld–Brown effect to hover.
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| ==See also==
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| * [[Aerodynamic levitation]]
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| * [[Apergy]]
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| * [[Artificial gravity]]
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| * [[Burkhard Heim]]
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| * [[Casimir effect]]
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| * [[Clinostat]]
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| * [[Electrostatic levitation]]
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| * [[Exotic matter]]
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| * [[Gravitational interaction of antimatter]]
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| * [[Heim Theory]]
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| * [[Magnetic levitation]]
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| * [[Optical levitation]]
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| * [[Reactionless drive]]
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| * [[Tractor beam]]
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| ''Fictional accounts''
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| * ''[[Despicable Me: Minion Mayhem]]'' has the Anti-Gravity Recycling Room
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| * ''[[LittleBigPlanet 2]]'' features a device called the Anti-Gravity Tweaker
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| * [[spindizzy]] is an anti-gravity drive in the science fiction novels of [[James Blish]]
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| ==References==
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| {{reflist|2}}
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| {{refbegin}}
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| * Cady, W. M. (15 September 1952). "Thomas Townsend Brown: Electro-Gravity Device" (File 24-185). Pasadena, CA: Office of Naval Research. Public access to the report was authorized on 1 October 1952.
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| * Li, N., & Torr, D. (1991). ''Physical Review'', '''43D''', 457.
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| * Li, N., & Torr, D. (1992a). ''Physical Review'', '''46B''', 5489.
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| * Li, N., & Torr, D. (1992b). ''Bulletin of the American Physical Society'', '''37''', 441.
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| {{refend}}
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| ==External links==
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| {{Sister project links|Anti-gravity}}
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| * [http://gltrs.grc.nasa.gov/reports/2006/TM-2006-214390.pdf Responding to Mechanical Antigravity], a NASA paper debunking a wide variety of gyroscopic (and related) devices
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| *[http://www.gravitation.org/institute_of_gravity_research/institute_of_gravity_research.html Göde Scientific Foundation]
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| {{Emerging technologies}}
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| {{Spacecraft propulsion}}
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| {{DEFAULTSORT:Anti-Gravity}}
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| [[Category:Anti-gravity| ]]
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| [[Category:General relativity]]
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| [[Category:History of physics]]
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| [[Category:History of science and technology in the United States]]
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| [[Category:Historiography of science]]
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| [[Category:Science fiction themes]]
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| [[Category:Fringe physics]]
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| [[Category:Pseudophysics]]
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| [[Category:Emerging technologies]]
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