Brady Haran

Brady John Haran (born 18 June 1976) is an Australian-born British independent filmmaker and video journalist who is known for his educational videos and documentary films produced for BBC News and his YouTube channels, the most notable being Periodic Videos and Numberphile.[1][2] Haran is also the co-host of the Hello Internet podcast along with fellow YouTuber CGP Grey. On August 22, 2017, Haran launched his second podcast, called The Unmade Podcast, and on November 11, 2018, he launched his third podcast, The Numberphile Podcast, based on his mathematics-centered channel of the same name.

Brady Haran
Brady Haran 01 (cropped)
Haran at the Dead Sea, 2013
Personal information
BornBrady John Haran
18 June 1976 (age 42)
NationalityAustralian, British
ResidenceBristol, England, United Kingdom
YouTube information
  • Periodic Videos
  • Sixty Symbols
  • Numberphile
  • Objectivity
  • Computerphile
  • Deep Sky Videos
  • Test Tube
  • Bibledex
  • Philosophyfile
  • Backstage Science
  • Hello Internet
  • foodskey
  • Psyfile
  • Words of the World
  • BradyStuff
Associated actsCGP Grey, Kylie Pentelow


Reporter and filmmaker

Brady Haran studied journalism for a year before being hired by The Adelaide Advertiser. In 2002, he moved from Australia to Nottingham, United Kingdom. In Nottingham, he worked for the BBC, began to work with film, and reported for East Midlands Today, BBC News Online and BBC radio stations.[3][4][5]

In 2007, Haran worked as a filmmaker-in-residence for Nottingham Science City,[3][6] as part of an agreement between the BBC and The University of Nottingham.[7] His "Test Tube" project started with the idea of producing a documentary about scientists and their research, but he decided to upload his raw footage to YouTube; from that point "Periodic Videos" and "Sixty Symbols" were developed.[3][6] Haran then left the BBC to work full-time making YouTube videos.[8]


Following "Test Tube", Haran decided to create new YouTube channels.[3] In his first five years as an independent filmmaker he made over 1500 videos.[8] In 2012, he was the producer, editor, and interviewer behind 12 YouTube channels[8] such as The Periodic Table of Videos,[9] Sixty Symbols and Numberphile.[3] Martyn Poliakoff received the Royal Society of Chemistry Nyholm Prize for Education in 2011 for work taking chemistry education to a wider audience; this included his work with Haran on The Periodic Table of Videos.[10]

Working with Poliakoff, Haran's videos explaining chemistry and science for non-technical persons received positive recognition.[1] Together, they have made over 500 short videos that cover the elements and other chemistry-related topics. Their YouTube channel has had more than 159 million views.[11] Also, Haran and Poliakoff authored an article in the Nature Chemistry journal[12] and an essay on Science journal[13] discussing the impact of The Periodic Table of Videos.

Haran frequently collaborates with professionals and experts, who often appear in his videos to discuss subjects relevant to their work. Most notably his series Periodic Videos features chemist Martyn Poliakoff, with the series also featuring chemist Stephen Liddle. The Numberphile channel has hosted a wide array of guests and presenters, including mathematicians James Grime, Elwyn Berlekamp, John Conway, Persi Diaconis, Rob Eastaway, David Eisenbud, Edward Frenkel, Hannah Fry, Ron Graham, Lisa Goldberg, Barry Mazur, Ken Ribet, Tadashi Tokieda and Terence Tao, computer scientists Don Knuth and Carlo H. Séquin, scientists Brian Butterworth, Ed Copeland, Laurence Eaves, and Clifford Stoll, and scientific writers and popularizers Alex Bellos, Steve Mould, Matt Parker, Tom Scott, and Simon Singh.[14] The Computerphile channel has hosted similar experts, such as computer science professor Michael Pound.

Hello Internet

Hello Internet Logo
Hello Internet Logo
Nail & Gear
Nail & Gear – chosen by the listeners in a postal referendum as the official flag of the Hello Internet podcast.[15]

In January 2014, Haran launched the podcast Hello Internet along with co-host CGP Grey, another YouTube educational content creator. The podcast peaked as the #1 iTunes podcast in the United Kingdom, United States, Germany, Canada, and Australia.[16] It was selected as one of Apple's best new podcasts of 2014.[17] The Guardian included the podcast among its 50 best of 2016, naming episode 66 ("A Classic Episode") its episode of the year. The paper described the podcast as having "in-depth debates and banter that is actually amusing".[18]

The podcast features discussions pertaining to their lives as professional content creators for YouTube, as well as their interests and annoyances. Typical topics include technology etiquette; movie and TV show reviews; plane accidents; vexillology; futurology; and the differences between Grey's and Haran's personalities and lifestyles.[19] Grey's and Haran's opinions and comments on feedback usually starts the next episode of the podcast. As a result of their conversations, Haran has been noted for reappropriating the term "freebooting," among other words, to refer to the unauthorised rehosting of online media.[20]

The podcast has an "official" flag called the Nail & Gear which was chosen from five candidates with a postal vote by the podcast's audience using an alternative vote system.[21][22][23]

The Unmade Podcast

In August 2017, Haran launched The Unmade Podcast along with co-host Tim Hein, a close friend of Haran.[24] The podcast features a discussion between the two of "ideas for podcasts that they will never make".[24] Most episodes last for approximately 40-75 minutes and each host is given the opportunity to pitch three podcast ideas in total. Hein and Brady then proceed to discuss these ideas in a light-hearted and often comedic manner. Along with the regular episodes, the podcast also has occasional 'special episodes'. These are usually, but not always, an opportunity for the hosts to attempt to actually create a podcast from an idea previously put forward on the show. A notable exception to this was the Antarctica special episode which departed from the usual format for Haran to discuss his recent visit to Antarctica with Hein.[25] As of December 2018, there have been six special episodes including the Antarctica special.

The Numberphile Podcast

In November of 2018, Haran launched The Numberphile Podcast, in which he speaks with various mathematicians in a longer-form version of his YouTube channel Numberphile.[26] Unlike with his others, Haran is the sole host of this podcast.


  • 2004 – BBC Ruby Television Awards Silver[27]
  • 2005 – BBC Ruby Television Awards Gold for 'Best Audience Generated Content'[28]
  • 2007 – BBC Ruby Television Awards Silver for work on the real life soap opera Alexandra Road[29]
  • 2008 – The Stevie Award (International Business Award) for 'Best Public Information/Interactive and Multimedia' for The University of Nottingham website[30]
  • 2008 – IChemE Petronas Award for 'Excellence in Education and Training' for The Periodic Table of Videos[31]
  • 2008 – European Excellence Award for 'Podcast' for An Element for Christmas[32]
  • 2011 – Science Magazine's Prize for 'Online Resources in Education' for The Periodic Table of Videos[31]
  • 2011 – Creativity International Platinum Award for 'New Media' for The Periodic Table of Videos[33]
  • 2012 – Webby Award for 'Reality Online Film & Video' for The Periodic Table of Videos[34][35]
  • 2016 – Kelvin Medal for Sixty Symbols (with Michael Merrifield and Philip Moriarty[36]
  • 2016 – Doctor of Letters (Honorary degree) - University of Nottingham[37]
  • 2017 – Radio Times Radio and Podcast Champion[38]


  • "YouTube in Its Element". Chemistry in Australia. 76 (10): 30–33. November 2009. ISSN 0314-4240. OCLC 4808833303. (with Martyn Poliakoff)
  • "Test tube: behind the scenes in the world of science". Nottingham Science City. University of Nottingham. OCLC 753944363.
  • "Teaching chem eng – Martyn Poliakoff and Brady Haran on Nottingham Uni's periodic table for the YouTube generation". The Chemical Engineer (812): 36. 2009. ISSN 0302-0797. OCLC 308533279. (with Martyn Poliakoff)
  • "Fantasy games 'not for geeks'". BBC News Online. 2003. OCLC 229408792.
  • Haran, Brady; Poliakoff, Martyn (21 February 2011). "How to measure the impact of chemistry on the small screen". Nature Chemistry. 3 (3): 180–182. Bibcode:2011NatCh...3..180H. doi:10.1038/nchem.990. PMID 21336314. (subscription required)
  • Haran, Brady; Poliakoff, Martyn (27 May 2011). "The Periodic Table of Videos". Science. 332 (6033): 1046–7. Bibcode:2011Sci...332.1046H. doi:10.1126/science.1196980. PMID 21617067.


  1. ^ a b Chemical Sciences Roundtable, National Research Council (2011). Chemistry in Primetime and Online: Communicating Chemistry in Informal Environments. National Academies Press. pp. 47–49, 54. ISBN 9780309187701. OCLC 756496720.
  2. ^ "Brady Haran's website". Retrieved 29 January 2013.
  3. ^ a b c d e Gurney, James (14 February 2012). "Impact Speaks To Brady Haran". Impact. Retrieved 10 February 2013.
  4. ^ "iCan reporter: Brady Haran". BBC. July 2004. Retrieved 24 February 2013.
  5. ^ "Quick chat with Brady – Numberphile Live". YouTube – Numberphile. Retrieved 24 February 2013.
  6. ^ a b "Nottingham science stories win international award". The University of Nottingham. August 2008. Archived from the original on 2 April 2015. Retrieved 24 February 2013.
  7. ^ "Test Tube". Retrieved 19 March 2013.
  8. ^ a b c Starke, Petra (29 January 2013). "YouTube 'how to' videos increasingly popular in Australia". Retrieved 21 February 2013.
  9. ^ Poliakoff, M; Haran, Brady (2009). The periodic table of videos. Nottingham, UK: University of Nottingham.
  10. ^ "Nyholm Prize for Education 2011 Winner". Royal Society of Chemistry. Royal Society of Chemistry. Retrieved 14 May 2016.
  11. ^ "Haran's YouTube Channel". YouTube. Retrieved 9 March 2016.
  12. ^ Haran, B.; Poliakoff, M. (2011). "How to measure the impact of chemistry on the small screen". Nature Chemistry. 3 (3): 180–182. Bibcode:2011NatCh...3..180H. doi:10.1038/nchem.990. ISSN 1755-4330. OCLC 4795274937. PMID 21336314.
  13. ^ Haran, B.; Poliakoff, M. (2011). "The Periodic Table of Videos". Science. 332 (6033): 1046–1047. Bibcode:2011Sci...332.1046H. doi:10.1126/science.1196980. ISSN 0036-8075. OCLC 4898209818. PMID 21617067.
  14. ^ "Numberphile - Videos about Numbers and Stuff". Retrieved 6 July 2016.
  15. ^ "H.I. No. 53 Two Dudes Counting". Hello Internet. 16 December 2015.
  16. ^ "CGP Grey & Brady Haran - 'Hello Internet' American iTunes Chart Performance". Retrieved 4 July 2014.
  17. ^ Haran, Brady; Grey, CGP (25 December 2014). "Bumper Christmas Special". Hello Internet (Podcast). 46:30 minutes in. Retrieved 15 May 2015.
  18. ^ "The 50 best podcasts of 2016". The Guardian. 21 December 2016. ISSN 0261-3077. Retrieved 21 December 2016.
  19. ^ "Top 3 Podcasts You Must Listen To In 2016". Intention Deficit. 31 December 2015. Archived from the original on 22 August 2017. Retrieved 17 April 2016.
  20. ^ Oremus, Will (17 July 2015). "Facebook's Piracy Problem". Slate. The Slate Group LLC. Retrieved 17 July 2015.
  21. ^ Haran, Brady; Grey, C.G.P. (16 December 2015). "Two Dudes Counting". Hello Internet (Podcast). Retrieved 31 December 2015.
  22. ^ "Hello, Hello Internet!". 22 November 2015. Retrieved 31 December 2015.
  23. ^ "Flag Vote". Hello Internet. Retrieved 13 April 2017.
  24. ^ a b "About". The Unmade Podcast. Retrieved 22 August 2017.
  25. ^ "Special: Antarctica". The Unmade Podcast. Retrieved 27 December 2018.
  26. ^ "The Numberphile Podcast". Brady Haran. Retrieved 25 December 2018.
  27. ^ Haran, Brady. "Brady Haran – video journalist & film-maker". Retrieved 31 January 2015.
  28. ^ "BBC 2006 review" (PDF). BBC Press Office. 2006. pp. 16, 17. Retrieved 10 February 2013.
  29. ^ "Watch again: Alexandra Road". BBC. 26 November 2007. Retrieved 10 February 2013.
  30. ^ and "2008 International Business Awards Honorees". 2008. Archived from the original on 29 January 2013. Retrieved 20 February 2013.
  31. ^ a b "Periodic tables professor Martyn Poliakoff is cult hit". BBC News. 25 February 2012. Retrieved 10 February 2013.
  32. ^ "What element do you want for Christmas (with video)". This is Nottingham. 15 December 2008. Archived from the original on 21 April 2013. Retrieved 10 February 2013.
  33. ^ "41st Annual Creativity International Awards". Creativity International Awards. Retrieved 10 February 2013.
  34. ^ "16th Annual Webby Awards Nominees & Winners". The Webby Awards. Archived from the original on 12 April 2012. Retrieved 14 February 2013.
  35. ^ "Some photos from the Webbys". Periodic Videos – Video Journalist Brady Haran. Retrieved 14 February 2013.
  36. ^ "IOP Award winners 2016". IOP Institute of Physics. Institute of Physics. Retrieved 16 February 2019.
  37. ^ "Doctor of Letters". Brady Haran. 21 July 2016. Retrieved 22 July 2016.
  38. ^ "2017 Radio Times Champion of Champions". RadioTimes. Retrieved 22 August 2017.

External links

15 (number)

15 (fifteen) is a number, numeral, and glyph. It is the natural number following 14 and preceding 16.

69 (number)

69 (sixty-nine) is a number following 68 and preceding 70.


Brady is a surname derived from the Irish surname Ó Brádaigh or Mac Brádaigh, meaning "Spirited; Broad."

In a listing by the U.S. Census Bureau of the Most Common U.S. Surnames, Brady is ranked at #411.Notable people whose first name is Brady include:

Brady Haran, Australian-British YouTuber, podcaster, and journalistNotable people whose surname is Brady include:

Alice Brady (1892–1939), American silent-film actress, Best Supporting Actress Oscar winner

Alison Brady, American photographer

Aindrias Mac Brádaigh, bishop of Kilmore, died 1445

Arthur Brady (footballer), Burnley footballer

Beau Brady (born 1981), Australian actor

Bill Brady (politician), Illinois state senator and candidate for governor

Brady baronets, a titled family in Ireland

Brian Brady Fianna Fáil Teachta Dála representing Donegal West (1932–1949)

Charles Brady (artist) (1926–1997), American-born Irish painter

Charles E. Brady, Jr. (1951–2006), American astronaut

Christian M. M. Brady (born 1969), American targumist

Conor Brady, Irish journalist and newspaper editor

Cyprian Brady, Irish politician

Dan Brady (Ohio politician), U.S. politician from Ohio

Dan Brady (Illinois politician), member of the Illinois House of Representatives

E. J. Brady (1869–1952), Australian journalist and writer

Edward Thomas Brady (born 1943), American judge and Associate Justice of the North Carolina Supreme Court

Edwin James Brady (1869–1952), Australian poet

Elward Thomas Brady, Jr. (c. 1926–2007), American politician

Fiachra Mac Brádaigh (fl. 1710–1760), Gaelic poet

Genevieve Garvan Brady (1880–1938), American philanthropist and Papal duchess

George Brady (1928–2019), Holocaust survivor

George K. Brady (1838–1899), United States Army officer, briefly commander of the Department of Alaska

Gerard Brady (born 1936), Irish Fianna Fáil politician and Minister for Education

Gilbert Mac Brádaigh Bishop of Ardagh from 1396 to 1400

Graham Brady (born 1967), British politician and MP

Hana Brady (1931–1944), Jewish holocaust victim

Aodh Mac Brádaigh (Hugh Brady) first Protestant Bishop of Meath and Kildare

Hugh R. Brady President of University College Dublin, Ireland

Ian Brady (born Ian Duncan Stewart 1938), a perpetrator of the Moors murders

James Brady (1940–2014), American White House Press Secretary shot alongside President Ronald Reagan

James Bernard MacBrady, Count of the Holy Roman Empire

James Buchanan Brady aka "Diamond Jim" (1856–1917), prominent American financier

James H. Brady (1862–1918), Governor of Idaho, United States Senator from Idaho

James M. Brady, editor of the Washington Post Online

James Patrick Brady (1908–1967?) Canadian Metis political figure

James T. Brady (1815–1869), New York City lawyer and politician

Jim Brady (baseball) (born 1936), American economist, educator, and baseball player and coach

Jim Brady (boxer), Scottish boxer of the 1930s and 1940s

Joan Brady, writer, the first woman – and the only American – to win the Whitbread Book of the Year Award for the Theory of War, lives in Oxford, England

Joan Brady, American writer of Christian novels

John Green Brady (1847–1918), American politician, Governor of the District of Alaska (1897–1906)

John Joseph Brady, American journalist and writer

John Riker Brady (1822–1891), New York State Supreme Court Justice, administered oath of office to President Chester A. Arthur

Joseph V. Brady, (1922–2011) neuroscientist

Karren Brady (born 1969), British sporting executive and broadcaster, best known as the former managing director of Birmingham City Football Club, the first woman to hold such a post in the top flight of English football when the team was promoted

Kevin Brady (born 1955), American politician from Texas

Liam Brady (born 1956), Irish footballer, coach, and television pundit

Mathew Brady (ca. 1823–1896), Irish-American photographer who documented the American Civil War

Matthew Brady (1799–1826), Australian bushranger

Matthew Brady (district attorney), American district attorney in San Francisco (1919–1943)

Mike Brady (golfer) (1887–1972), American professional golfer

Mike Brady (musician) (born 1947), Australian musician

Michael Mac Brádaigh (died 1745), Jacobite

Nicholas Brady (poet) (1659–1726), divine and poet

Nicholas Brady (philanthropist) (1878–1930), businessman and philanthropist

Nicholas Brady (banker) (born 1930), banker and Secretary of the Treasury

Nicholas Brady, victim in the Byron David Smith killings

Patrick Henry Brady (born 1936), United States Army Helicopter Pilot, Medal of Honor recipient (1968)

Paul Brady (born 1947), Irish singer/songwriter

Paul L. Brady, American judge

Peter R. Brady (1825–1901), Arizona pioneer; first elected sheriff of Pinal County; sheriff of Pima County, Arizona

Fedlim Mac Brádaigh, (fl. 1710), Gaelic poet usually referred to as "bold Phelim Brady the bard of Armagh"

Phillip Mac Brádaigh, (died 1719), Gaelic poet and a Protestant clergyman

Richard Mac Brádaigh (died 1607), Franciscan bishop of Kilmore

Robert A. Brady (1901–1964), American economist

Robert A. ‘Bob’ Brady (born 1945), a United States Congressman

Robert David Brady (born 1946), American modernist sculptor

Royston Brady (born 1972), Irish businessman and former politician

Samuel Brady (1756–1795), American military captain during the Ohio Valley's frontier days

Sarah Brady (1942–2015), American gun control activist, wife of James Brady

Scott Brady (1924–1985), American actor

Seán Brady (born 1939), Archbishop of Armagh (1996–2014)

Shannon Brady (born 1996), Australian footballer for the Brisbane Roar

Terence Brady (born 1947), Australian Auxiliary Bishop of the Roman Catholic Archdiocese of Sydney since 2007

Terence Brady (1939–2016), Irish actor and writer

Tom Brady (born 1977), American football quarterback and 6 time Super Bowl champion and 4-time Super Bowl MVP

Thomas Mac Brádaigh (1752–1827), farmer's son from Cootehill, County Cavan, became a Field Marshal in the Austrian service and Governor of Dalmatia

Thomas A. Mac Brádaigh (1813–1847), Lt. USMC, Among the 40 marines who stormed the "Halls of Montezuma", September 13, 1847

Vincent Brady (born 1936), Irish Fianna Fáil politician, Government Chief Whip (1987–1991), Minister for Defence (1991–1992)

Wayne Brady (born 1972), American comedian and TV personality

W. Tate Brady (1870–1925), Pioneer businessman of Tulsa, Oklahoma

William J. Brady (1829–1878), Sheriff of Lincoln County during the Lincoln County Wars

William O. Brady (1899–1961), American Roman Catholic Archbishop of St. Paul (1956–1961)

William Maziere Brady (1825–1894), author of Episcopal Succession in England, Scotland and IrelandBrady may also refer to:

Brady v Brady [1989] AC 755, an English judicial decision of the House of Lords

Brocard's problem

Brocard's problem is a problem in mathematics that asks to find integer values of n and m for which

where n! is the factorial. It was posed by Henri Brocard in a pair of articles in 1876 and 1885, and independently in 1913 by Srinivasa Ramanujan.

CGP Grey

CGP Grey is the YouTube channel name of an American-Irish educational YouTuber and podcaster who has been posting on YouTube under the channel name since 12 August 2010. Grey also posts videos on his secondary channel, CGPGrey2, and livestreams gameplay on another channel, CGP Play.His YouTube channel mainly features short explanatory videos on varying subjects, including politics, geography, economics, history, and culture. The channel's most popular video is an explanation of the terminology of the British Isles, which went viral in 2011. Grey's videos have since received increasing attention, and have been reviewed in several publications, including Business Insider and The Washington Post.In addition to video production, Grey is known for creating the audio podcast Hello Internet in 2014 with fellow educational YouTuber Brady Haran. Since 2015, he has also hosted the audio podcast Cortex with Myke Hurley of Relay FM. Along with Philipp Dettmer and Dave Wiskus, Grey started the company Standard Broadcast LLC, which provides production and administrative support to digital creators.


A googolplex is the number 10googol, or equivalently, 10(10100). Written out in ordinary decimal notation, it is 1 followed by 10100 zeroes, that is, a 1 followed by a googol zeroes.

Graham's number

Graham's number is an immense number that arises as an upper bound on the answer of a problem in the mathematical field of Ramsey theory. It is named after mathematician Ronald Graham, who used the number as a simplified explanation of the upper bounds of the problem he was working on in conversations with popular science writer Martin Gardner. Gardner later described the number in Scientific American in 1977, introducing it to the general public. At the time of its introduction, it was the largest specific positive integer ever to have been used in a published mathematical proof. The number was published in the 1980 Guinness Book of World Records, adding to its popular interest. Other specific integers (such as TREE(3)) known to be far larger than Graham's number have since appeared in many serious mathematical proofs, for example in connection with Harvey Friedman's various finite forms of Kruskal's theorem. Additionally, smaller upper bounds on the Ramsey theory problem from which Graham's number derived have since been proven to be valid.

Graham's number is much larger than many other large numbers such as Skewes' number and Moser's number, both of which are in turn much larger than a googolplex. As with these, it is so large that the observable universe is far too small to contain an ordinary digital representation of Graham's number, assuming that each digit occupies one Planck volume, possibly the smallest measurable space. But even the number of digits in this digital representation of Graham's number would itself be a number so large that its digital representation cannot be represented in the observable universe. Nor even can the number of digits of that number—and so forth, for a number of times far exceeding the total number of Planck volumes in the observable universe. Thus Graham's number cannot even be expressed in this way by power towers of the form .

However, Graham's number can be explicitly given by computable recursive formulas using Knuth's up-arrow notation or equivalent, as was done by Graham. As there is a recursive formula to define it, it is much smaller than typical busy beaver numbers. Though too large to be computed in full, the sequence of digits of Graham's number can be computed explicitly through simple algorithms. The last 12 digits are ...262464195387. With Knuth's up-arrow notation, Graham's number is , where

Hello Internet

Hello Internet is an audio podcast hosted by YouTube content creators Brady Haran and CGP Grey.

Le Boreal

Le Boreal is a cruise ship owned and operated by the French cruise line company Compagnie du Ponant.

Lorentz factor

The Lorentz factor or Lorentz term is the factor by which time, length, and relativistic mass change for an object while that object is moving. The expression appears in several equations in special relativity, and it arises in derivations of the Lorentz transformations. The name originates from its earlier appearance in Lorentzian electrodynamics – named after the Dutch physicist Hendrik Lorentz.Due to its ubiquity, it is generally denoted γ (the Greek lowercase letter gamma). Sometimes (especially in discussion of superluminal motion) the factor is written as Γ (Greek uppercase-gamma) rather than γ.

Messier 65

Messier 65 (also known as NGC 3623) is an intermediate spiral galaxy about 35 million light-years away in the constellation Leo. It was discovered by Charles Messier in 1780. Along with M66 and NGC 3628, M65 forms the Leo Triplet, a small group of galaxies.

NGC 4550

NGC 4550 is a barred lenticular galaxy located in the constellation of Virgo that can be seen with amateur telescopes. It lies at a distance of 50 million light-years (15.5 mega parsecs) from the Milky Way and is a member of the Virgo Cluster.

NGC 6744

NGC 6744 is an intermediate spiral galaxy about 30 million light-years away in the constellation Pavo. It is considered as a Milky Way mimic in our immediate vicinity, displaying flocculent (fluffy) arms and an elongated core. It also has at least one distorted companion galaxy (NGC 6744A) superficially similar to one of the Magellanic Clouds. It was discovered from Parramatta in Australia by Scottish astronomer James Dunlop on 30 June 1826.NGC 6744 lies within the Virgo Supercluster.

Periodic Videos

The Periodic Table of Videos (usually shortened to Periodic Videos) is a series of videos about chemical elements and the periodic table. They are published on YouTube and produced by Brady Haran, a former BBC video journalist, featuring Sir Martyn Poliakoff ("The Professor"), Peter Licence, Stephen Liddle, Debbie Kays, Neil Barnes, Sam Tang and others at the University of Nottingham.

Sexy prime

Sexy primes are prime numbers that differ from each other by 6. For example, the numbers 5 and 11 are both sexy primes, because 11 - 5 = 6.

The term "sexy prime" is a pun stemming from the Latin word for six: sex.

If p + 2 or p + 4 (where p is the lower prime) is also prime, then the sexy prime is part of a prime triplet.

Shannon number

The Shannon number, named after Claude Shannon, is a conservative lower bound (not an estimate) of the game-tree complexity of chess of 10120, based on an average of about 103 possibilities for a pair of moves consisting of a move for White followed by one for Black, and a typical game lasting about 40 such pairs of moves.

Solar telescope

A solar telescope is a special purpose telescope used to observe the Sun. Solar telescopes usually detect light with wavelengths in, or not far outside, the visible spectrum. Obsolete names for Sun telescopes include heliograph and photoheliograph.

Vulcan laser

The Vulcan laser is an infrared, 8-beam, petawatt neodymium glass laser at the Rutherford Appleton Laboratory's Central Laser Facility in Oxfordshire, United Kingdom. It was the facility's first operational laser.

It is designed to deliver irradiance on target of 1021 W/cm2 for a wide-ranging experimental programme in fundamental physics and advanced applications. This includes the interaction of super high intensity light with matter, fast ignition fusion research, photon induced nuclear reactions, electron and ion acceleration by light waves, astrophysics in the laboratory and the exploration of the world of plasma dominated by relativity.

In 2005 the Vulcan laser was the highest-intensity focussed laser in the world, certified by the Guinness Book of World Records, capable of producing a petawatt laser beam with a focused intensity of 1021 W/cm2.

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