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These are the show notes and errata for episode 35, “Great Balls of Physics“, featuring guest Anna Ahveninen, discussing Terry’s 1999 collaboration with Jack Cohen and Ian Stewart, The Science of Discworld.

• The episode title plays on the classic Jerry Lee Lewis song, “Great Balls of Fire”, in honour of Roundworld’s tendency to shape matter into spheres.
• Anna (and Liz and Ben) know that pharmacists do not just “sell molecules”. Modern pharmacy is the science of understanding and preparing medicines. Pharmacists are highly trained healthcare professionals, rightly held in high regard. But in “Commonwealth English”, “chemist” is a common synonym for pharmacist, hence Anna’s joke and our hyperbolic extension of it. (While we’re on the subject, it’s not entirely true that “everything” is made of molecules, but certainly everything that humans are likely to sell on Earth is.)
• The story of the science fiction convention, which was held in the Hague in an unspecified year, appears in the book in Chapter 22, “Things That Aren’t”. Jack Cohen gave a longer account of Terry’s involvement, as well as some other background on how the book was written and published, in the Guardian article “Terry Pratchett and the real science of Discworld” by Sam Jordison, published a couple of months after Terry’s death.
• A Teaspoon and an Open Mind: The Science of Doctor Who was written by Michael White in 2005, and if Ben were feeling uncharitable he might suggest it was rushed out to cash in- er, coincide with the hugely successful revived series that same year. White is an English author and former member of 80s band The Thompson Twins who now writes novels, but has also written a number of acclaimed biographies of da Vinci, Newton, Einstein, Tolkien, Asimov and many more. He also wrote The Science of The X-Files – which gets mentioned in the introduction of The Science of Discworld! The Doctor Who book’s title comes from the 1979 story The Creature From the Pit, in which the Doctor, having succeeded where another has failed, quips: “Well to be fair I had a couple of gadgets he probably didn’t, like a teaspoon and an open mind.” This line was almost certainly influenced by Douglas Adams, who was script editor of Doctor Who at the time. A Teaspoon and an Open Mind is also the title of the dedicated Doctor Who fan fiction site whofic.com.
• Paul Davies is a famous English physicist and broadcaster who has written thirty books, most of them popular science titles which were bestsellers in the 1980s and 1990s. His most famous books are God and the New Physics (1983), The Mind of God (1992), and Ben’s favourite, How to Build a Time Machine (2002). Though less prolific in recent years, he did publish a new book in 2019: The Demon in the Machine.
• Back to the Future Part II and Part III were filmed “back to back”, meaning that they were produced together, one immediately after the other. This allowed the two to make numerous references to each other and include many of the same actors.
• In the 2007 Doctor Who story “Blink”, often cited as one of the best, the Tenth Doctor famously explains causality and time travel like this: “People assume that time is a strict progression of cause to effect, but, actually, from a non-linear, non-subjective viewpoint, it’s more like a big ball of wibbly-wobbly… timey-wimey… stuff.”
• Jack Cohen was a zoologist with a long career in academia, and also advised science fiction authors how to write plausible aliens, including Anne McCaffrey, Harry Harrison, Larry Niven and Terry himself. He died in 2019. Ian Stewart is a mathematician who has written a large number of academic and popular mathematics books. Both worked at the University of Warwick, which granted Terry Pratchett his first honorary degree in 1999 following the publication of The Science of Discworld. (At the same ceremony, Terry made Jack and Ian honorary wizards of Unseen University.)
• Orwell’s Revenge: The 1984 Palimpsest is a 1994 book by Peter Huber which tries to refute the dystopia of 1984, claiming that information technology will always be subverted for good because information wants to be free. Ben was skeptical when he first read it twenty-four years ago, and is no less skeptical now he’s discovered it was one of Mark Zuckerberg’s picks for his public book club in 2015.
• Thaumaturgy comes from Greek, and means “miracle work” or “wonder work”. It is not only used to describe magic, but also the ability of some saints to perform miracles. In the roleplaying game Vampire: The Masquerade, the vampire clan Tremere are descended from a cabal of human mages who transformed themselves into vampires to achieve immortality, but lost their ability to use wizard magic. They developed a type of blood magic based on hermetic principles as a replacement, which they call thaumaturgy. (Ben’s pronunciation is correct.)
• The Manhattan Project was the US Army’s effort to build nuclear weapons during World War II. As part of the project, the world’s first nuclear reactor, Chicago Pile-1, was built in an old squash court in Stagg Field, a football field and sports complex at the Hyde Park campus of the University of Chicago. It was completed on December 1, 1942, and the reaction started with removal of the control rods the next day.
• Ben’s old saying about specialists is one that’s evolved a lot over time and likely has multiple origins, as so many of these things do. The earliest example seems to be from William Warde Fowler, a scholar at the University of Oxford, who used a shorter version of the phrase in a review published in 1911. The earliest version to add the bit about “knowing everything about nothing” also included the saying’s witty opposite, from Stanford University’s Robert E. Swain, appropriately enough a chemist, in 1928. He was talking about the difference between scientists and philosophers: “Some people regard the former as one who knows a great deal about a very little, and who keeps on knowing more and more about less and less until he knows everything about nothing. Then he is a scientist. Then there are the latter specimen, who knows a little about very much, and he continues to know less and less about more and more until he knows nothing about everything. Then he is a philosopher.”
• A Brief History of Time: From the Big Bang to Black Holes is Stephen Hawking’s bestselling popular science book, first published in 1988. Special and general relativity are covered in chapter two, which might challenge a few readers, but chapter four – while less than twenty pages long – introduces mind-bending ideas from quantum mechanics like the “spin” of quarks. Because it sold 25 million copies but contains such difficult concepts, it is often called “the most unread book of all time”. (There’s no shame in this; have another go if you like!) In 2014, American mathematician Jordan Ellenberg used publicly available data on Amazon Kindle highlighting to judge which books were abandoned partway through, a measure he cheekily called the “Hawking Index”. A Brief History of Time appeared as the third or fourth in the list.
• What Does a Martian Look Like? The Science of Extraterrestrial Life was originally published as Evolving the Alien: The Science of Extraterrestrial Life in 2002. Its central thesis is that if we want to find life elsewhere in the universe, we need to broaden our understanding of the forms life might take, as our current searches only look for life similar to that found on Earth. “Jack&Ian” appears in the preface as the name of their “collective entity”, though it should be noted that the book is largely based on Jack’s often given lecture “The Possibility of Life on Other Planets”, or POLOOP, which he had originally wanted to call “What Does a Martian Look Like?”
• It is generally acceptable to reference your own work in science academia…though since the frequency with which a researcher’s work is cited is a mark of respectability and influence, there have been those who perhaps do so too often…
• We’ve mentioned Arthur C Clarke, famous author of 2001: A Space Odyssey and many other influential science fiction novels before. Clarke’s most famous quote, “any sufficiently advanced technology is indistinguishable from magic“, was the last of his “three laws”, added to a revised version of his 1962 essay “Hazards of Prophecy: the Failure of the Imagination” in 1973. (The other two are much less famous.) The converse law quoted in the front of the book, “any technology distinguishable from magic is insufficiently advanced“, is attributed in the first edition of The Science of Discworld to Gregory Benford – but while a version of it does appear in Benford’s 1997 book Foundation’s Fear, the original appears to have been written by Professor Barry Gehm, published in the science fiction magazine Analog as “Gehm’s Corollary to Clarke’s Third Law” in 1991.
• The story from The Simpsons in which Bart messes up Lisa’s science project, creating a miniature world full of tiny people in a bathtub, is the segment “The Genesis Tub” from the Halloween special “Treehouse of Horror VII” in 1996.
• We previously referred to the universes hidden inside things in the first two Men in Black films in our Truckers episode, “Upscalator to Heaven“. In the first film, aliens play with a marble which somehow contains the Milky Way galaxy, while in the sequel, our entire universe is shown to exist within a locker in an alien train station.
• A microcosm is any subset of a thing which is said to represent the whole. Ben’s wordplay “microcosmos” isn’t that clever, since the word comes via Latin from the Greek mikros kosmos, which literally means “tiny cosmos”.
• Ben used out of old habit he is trying to break the older LGBT acronym, which is now considered incomplete. The longer version preferred these days is LGBTIAQ+, which encompasses lesbian, gay, bi, trans, intersex, asexual and/or agender, queer and more identities. The intent of the acronym is to represent the diversity of experience outside of “traditional” binary gender and heterosexuality. While not everyone likes it or identifies with the term, “queer” is commonly used as spoken shorthand for the acronym.
• The first clear fossil evidence of dinosaur feathers was found in the 1990s, and palaeontologists have only found more since then.
• The luminiferous æther – not to be confused with the class of organic compounds called ether – was a proposed “medium” of some kind of matter that filled space, and explained the transmission of light waves. In 1887, scientists Albert A. Michelson (who made some of the early precise measurements of the speed of light) and Edward W. Morley (famous for measuring the precise atomic weight of oxygen) conducted an experiment to detect the motion of the Earth through the æther. It failed, leading to the end of æther theory, and paving the way for others, including Einstein’s special relativity.
• There are currently 118 chemical elements that have been identified. New elements are acknowledged by a Joint Working Party formed in 1999 by the International Union of Pure and Applied Chemistry (IUPAC) and the International Union of Pure and Applied Physics (IUPAP). It can take years between the first experimental discovery and formal acceptance of a new element, as initial claims are often disputed. The most recent four were acknowledged in 2015 and officially named in 2016, but were first synthesised years earlier. In order of their first recognised synthesis, they are:
  • Oganesson (Og, atomic number 118, named after Russian physicist Yuri Oganessian) in 2002;
  • Moscovium (Mc, atomic number 115, named after Moscow) in 2003;
  • Nihonium (Nh, atomic number 113; named after Japan, Nihon) in 2004; and
  • Tennessine (Ts, atomic number 117, named after the US state of Tennessee) in 2009.
• Plumbum is the Latin name for lead, which is why its chemical symbol is Pb. (This also helps distinguish it from the five other elements with names that begin with L.)
• The idea that science works by disproving things was popularised by philosopher Karl Popper as falsifiability or falsificationism. Popper claimed that science worked not by looking at evidence in the world and using that to formulate laws, but by formulating laws and then testing them against reality, trying to prove them false. As Liz says, this is a lie-to-children – or at least a step in the development of the philosophy of science.
• Pluto’s status had been in question since 1992, when several other similarly-sized objects were discovered in the Kuiper belt. In 2005 a bigger object, Eris, was discovered, and so in 2006 the International Astronomical Union decided to formally define what a planet was. As a result they also created the classification of “dwarf planet”, which they applied to Eris, Pluto and several other Kuiper Belt Objects.
• Winter in Game of Thrones, like Summer, lasts a long but variable time – sometimes many “years”. (How they even have “years” of standard length when the seasons are like this is unclear.) Despite fan attempts to devise solar system models that might explain this, George R R Martin – author of the A Song of Ice and Fire novels on which the show is based – is on record saying there is a non-scientific explanation for the seasons that will be revealed by the time he finishes writing the series.
• The term “virtual reality” had become popular by the 1980s, and the first publicly available VR arcade games and consoles as early as the mid-90s, but the technology didn’t really take off while computer graphics were incapable of producing realistic looking worlds. Affordable VR headsets and kits became viable in 2010 with the invention of the Oculus Rift, and there are now several different commercially available VR systems, the most popular being Playstation VR, released in 2016 by Sony.
• The Lawnmower Man is a 1992 film very much not based on the short story of the same title by Stephen King, who sued the production company to have his name removed from posters even though they did own the film rights to the story. In the film, Pierce Brosnan plays a scientist who uses experimental drugs and VR technology to improve the intelligence of Jobe, an intellectually disabled man who works mowing lawns. Jobe becomes malevolent and “uploads” himself into “cyberspace”. It’s…look, it’s very 1990s.
• The Last of Us is a 2013 videogame for the Playstation 4 set in a dystopian future America where humans and many other animals have been taken over by a mutated version of the Cordyceps fungus. Cordyceps is a real genus, though the famous example which infects ants and alters their behaviour is now reclassified as Ophiocordyceps unilateralis. The fungus causes ants to climb to the underside of leaf and grab on tight, where it dies. The fungus replaces its body tissues and grows a fruiting body out of its head to spread its spores, and what’s more it’s been doing this to poor little ants for around 50 million years or more.
• The Andalite Chronincles are better known as Animorphs, which we’ve previously talked about in #Pratchat19, “It Don’t Mean a Thing if it Ain’t Got Rocks In“. The Yeerks are small parasitic aliens, and mortal enemies of the animorphs, teenagers given shapeshifting powers in order to fight back against the Yeerk invasion.
• Jack&Ian coined the term “extelligence” in their first book together, Figments of Reality: the Evolution of the Curious Mind in 1997. They define it in the introduction as “the accumulating knowledge of generations of intelligent beings” and consider it “a thing or process with its own characteristic structure and behaviour” requiring a new name. The book is largely devoted to exploring it. While it’s not as clear in The Science of Discworld, both Figments of Reality and What Does a Martian Look Like? explicitly include cultural knowledge like folklore and other non-written forms of knowledge as part of extelligence.
• SimEarth was originally released in 1990, and was the second game in the “Sim” series following SimCity. (The third was SimAnt, in 1991.) It wasn’t just based on James Lovelock’s work; he directly advised on the game and wrote an introduction for the manual. As well as intelligent dinosaurs, it was possible to have machine life (assuming an advanced civilisation blew themselves up), intelligent carnivorous plants, and yes, a crustacean civilisation could totally be a thing.
• The short story collection about women associated with the Nobel Prize is Ordinary Matter by Australian writer Laura Elvery, published in September 2020 by University of Queensland Press.
• If you’re interested in a perspective on sexism in the Nobel Prize (along with other biases), this article on Massive Science is a good starting point.
• While we’re used to thinking about Discworld wizards as men and witches as women, there are exceptions. Eskarina Smith, the Disc’s first woman wizard, appears in Pratchett’s third Discworld novel Equal Rites, which we covered in #Pratchat25, “Eskist Attitudes“. Watch out for more on that front in future episodes. (No spoilers for books we’ve not covered yet!)
• Mileva Marić was a Serbian physicist and mathematician. Her career in academia was interrupted by her relationship with Albert Einstein, who was her lover, husband and the father of her children. While she is not credited as a co-author on any of his work, there is evidence to suggest she may have substantially assisted Einstein in his early work, including the papers for which he won the Nobel Prize.
• There are plenty of podcast episodes about the forgotten women of science, but so far we’ve not found a whole show about this. Let us know if you find one! Meanwhile some good feminist science podcasts are Lady Science and Superwomen in Science, while great more general science shows hosted by women are Ologies with Alie Ward and Talk Nerdy with Cara Santa Maria.
• For books on women in science, Anna recommends Women in Science by Rachel Ignotofsky, Inferior by Angela Saini and Invisible Women by Caroline Criado Perez. You can also check out the books on the STEMMinist book club list. (As usual, we recommend sourcing them from a local independent book shop, who can order in anything you want and needs your custom more than Amazon or BookDepository.)
• William of Ockham (1287 – 1347) was a friar, philosopher and theologian whose most famous contribution to what would become scientific thought was the idea that “entities should not be multiplied without necessity” – i.e. that an explanation that involves fewer things is more likely correct. This is known as the law of parsimony, or more famously, Occam’s Razor – hence the beard gag. (It should be noted that William himself used the idea to defend the idea of miracles.)
• In most versions of The Hitchhikers Guide to the Galaxy, Arthur Dent and Ford Prefect end up on a space ark full of middle managers and other people claimed by their society to be the “useless” third, sent to crash into prehistoric Earth. On Earth, Arthur tries to communicate with the original inhabitants, the not-cave-people (they don’t live in caves), by teaching them to play Scrabble with tiles he makes himself. It doesn’t work. The Primary Phase of the radio series, the second book The Restaurant at the End of the Universe, and the original television series all end with Arthur and Ford trying to determine the Ultimate Question of Life, the Universe and Everything by getting the not-cave-people to pull Scrabble letters out of a bag at random.
• Ben thought about including all the cancelled space missions in these show notes, but decided to save that depressing list for the separate article he might write with updates on some of the science in the book.
• Humans have rarely thought scientifically about the Flat Earth. It was clear to many ancient civilisations that the planet must be round, and the first written account of the spherical Earth was in about 250 BCE by Eratosthenes and other Greeks, using geometry to mathematically prove its shape and possibly accurately calculate its size. (Jack&Ian point out that the accuracy is based on modern estimates of the unit they used, the stadion, but they are maybe a little overly suspicious.)
• Flatland: A Romance of Many Dimensions is a satirical 1884 novella by English schoolteacher Edwin A Abbott. As well as considering how two-dimensional beings might experience one- or three-dimensional worlds, it is also a fairly savage satire of the Victorian class system; the sexual politics of the book are either even more savage satire, or emblematic of the sexism of the time, depending on your interpretation. Ian Stewart not only wrote a sequel, Flatterland, in 2001, but an annotated version of the original, The Annotated Flatland, in 2002 (the same year as the updated The Science of Discworld and its sequel).
• Mosasaurs are now well-known to the general public after appearing in a marine exhibit in the film Jurassic World, the 2015 sequel to the original three Jurassic Park films. Two different species of mosasaur were featured in the final episode of Impossible Pictures’ Sea Monsters, a 2003 follow up to 1999’s Walking with Dinosaurs.
• Listener Bel described three categories of lies-to-children:
  • Protecting children e.g. “The world is a good and safe place”, stranger danger, “adults know what they’re doing”
  • Simplifications e.g. there are goodies and baddies and you can tell the difference by looking at them, “this is what an atom looks like”
  • Protecting adults, or “keeping the status quo”, e.g. sexism, racism, ableism, ageism and many more.
• On being able to tell that a creature had hooves from its tooth, the specific instance Jack&Ian mention is of the Tingamarra tooth, which supposedly “demolished” the theory that placental mammals never made it to Australia. That call was a bit premature, since the claim is regarded at best as highly controversial and has not significantly changed the view of Australian palaeontology. It is still the consensus that the only placentals to arrive in Australia before humans were bats and rodents.
• Temperance “Bones” Brennan is a fictional forensic anthropologist and protagonist of all twelve seasons of the television series Bones, which ran from 2005 to 2017. She’s played by Emily Deschanel. The television series is based on the Temperance Brennan series of novels by Kathy Reichs, which began with Déjà Dead in 1997 and, as of 2021, includes twenty novels and a short story collection. Ben is glad he missed this reference because while forensic anthropology is real – Reichs is one herself! – the show is pretty ridiculous. Bones has a hologram table! But it’s all good fun, and it gave David Boreanaz something to be cool and vulnerable in after Angel finished.
• Teeth are great for palaeontologists because their enamel allows them to be preserved, and their shape and patterns of wear can be used to determine a great deal about diet and behaviour. Teeth are also very distinctive, and so you can tell a hooved animal’s tooth from that of an elephant or similar.
• Liz’s joke about a creature with “don” in its name being really into “ham” is a reference to popular Australian ham, bacon and smallgoods brand Don. They are famous for their slogan “Is Don. Is good.”, coined for a series of ads in which a man spruiks their products in slightly broken, accented English before concluding with the phrase. (The same actor also plays the owner of a Gogomobil in another famous Australian ad from 1992 for the Yellow Pages phone directory. We have a lot of famous ads, probably because most of our television is otherwise sourced from the US or the UK; ad breaks were some of the rare times when you’d see Australian actors and sometimes hear Australian accents.)
• To answer Liz’s questions: Are beak just giant tooth? No. Beak are is hair? …also no, but closer. Beaks are made of keratin, which is the same protein from which hair is formed. But there are two kinds of keratin: alpha-keratin is found in all vertebrates, and is used to form hair, wool and other softer but tough materials, like the outer layers of bony horns; and beta-keratin, found only in reptiles and birds, which is used to make scales, claws, feathers, shells and beaks.
• Evolutionary electronics – also known as evolvable hardware – is totally a real thing, as is the circuit described in the book, evolved by Adrian Thompson at the University of Sussex in 1996. Though it hasn’t led to anything groundbreaking, the same principles can be used to make adaptive hardware that can alter itself in response to changes in the environment.
• A blimp is an inflatable airship that doesn’t have any internal structure – basically a big shaped balloon held in shape by internal pressure. “Zeppelin” is the common name for rigid airships, in which the body is supported by an internal structure. Zeppelin was the name of the German aircraft manufacturer which built many of the most famous airships, including the Hindenburg. The company vanished for around fifty years following World War II, but was revived in 2001 and still operates today – including working with Goodyear to replace their older blimps with semi-rigid airships. These have a supporting keel along the base of the envelope that holds the lifting gas, but no other internal structure.