Suggestion Page

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Create an account, login and click on "edit" (here or above) and add your suggestion for the text. I'll comment as soon as I can. Thank you for your help!


Please add errata and misprints on the dedicated page.


0. Suggestions on distribution issues

  • You specify permissive distribution terms on your webpage. It might be even better to explicitly specify a Creative Commons license for your work. In particular your terms seem to match the CC-BY-NC-ND license (no commercial usage, no derivative works). Using a CC license (and linking it on your page) will automatically index the work in Creative Commons databases, and clearly signals to readers that they are allowed to redistribute copies to others. (CS: I'll start the comparison of the two licences.)
  • Add a downloadable cover page with title author & copyright for those downloading only sections of the book (CS: good point - thank you)
  • Html version, split by chapter. Easier for mobile devices and lower power machines to process. (CS: this will happen only on the day that html looks as good as pdf ...)
  • Study guide based RSS/Email feed, daily, weekly, monthly etc. To gently introduce people to the idea, as the whole book is very intimidating. (CS: let me know what aspect is intimidating, and I'll change it!)
  • Add an FTP and/or a BitTorrent download in addition to the current one. (CS: would you explain me how to organize a bittorrent? I know nothing about it ...)
  • Add your book to the Open Library catalog of every book ever published. this could make more people find it and read it. the site address is: http://openlibrary.org/


1. Suggestions for new images and films

  • Add more pictures of machines (maybe in a separate section; e.g. textile machine, turkey machine by Stork, tiny machines, calculating machines, etc.)
  • Add more pictures of experimental set-ups.
  • Show film of quartz oscillator.
  • Add film of group and phase velocity.
  • Add film of bouncing water droplet.


2. Suggestions for improvements and better explanations

Please add errata and misprints on the dedicated page.

  • Page 14: In the appetizer section the list of limits should also be explained in words either before or after the symbolic statements. In this section of the text you are highlighting its accessibility however the list of limits without explanation (a least a little) made me skip over that section.
  • Section "Simple motion of extended bodies - oscillations and waves" - should define more properly group velocity and phase velocity (and maybe include signal velocity and anomalies with group velocity and transport of energy and information). Avoid terms like velocity of individual waves (e.g. page 230, 8th line from the bottom). Maybe show why is group velocity dw/dk and for phase velocity w/k.
  • Page 234, 2nd footnote: I was struck by the revelation about the "true" story of the Galileo trial. Since I had never heard of this theory before, I tried to learn more and I have found a (very interesting) paper in JSTOR [1] that thoroughly dissects and rebuts Redondi's 1983 book. I think you should investigate if Redondi's thesis has ever gained any consensus among scholars. Even if I am sympathetic to "revolutionary" ideas, the counter arguments that I read in the paper look very, very compelling. (CS: I have read the paper and Redondi's answer to it - which appeared only in Italian, I think. I have also corresponded with all authors involved. Furthermore, I have read the new research results, which have been published in 2000. The ideas of Redondi have been vindicated by new findings in the archives. The new version of the text will contain a better explanation, because my summary in version 21 also contains several errors.)
  • Page 249, Challenge 494: Mention Magnus effect (lift when ball is rotating), which is altered by dimples and hairiness of the balls. (CS: have tendency not to, as the question is about drag.)
  • Page 270, 2nd footnote: Your division by 2 arises from consideration of quadratic systems, whose energy is proportional to some randomly-distributed coordinate squared. Keith Stowe's text illustrates this nicely. Thus it's useful in many, but by no means all, cases. In that context non-quadratic spin, laser, and other systems capable of inverted population states would also let you extend your temperature table on Page 260 past positive infinity into the negative absolute temperature range. more (CS: negative temperatures are a funny curiosity but never to be taken seriously. I will add a a few statements on them. But the k vs. k/2 issue is not easy; I'd like to have more details on it; are you saying that other system can go lower than k/2? I have never seen such a system.)
  • Page 321, Challenge 20: change Sessa ben Zahir to Sissa ben Dahir, change rice to wheat, change 100 mg to 40 mg, add chaturanga (chathurangam), add that it is attributed to Abu-l ‘Abbas Ahmad Ibn Khallikan (1211–1282) as source of the legend ((London, 1843‑1871, Biographical dictionary of Ibn Khallikan, vol. III, p. 71), King Shihram and king Balhait, add 2nd to 4th century CE as origin, add wheat world production in 2004 624 million tons (2^{64} - 1 = 18.446.744.073.709.551.615 of 40 mg grains is about 740 000 million tons, about 1200 times the world yearly production) (by FL - thank you) The doubling 64 number for chess is alread mentioned in "the meadows of gold" - but not the sissa legend. The historian, Abu ul-Hasan 'Ali ibn Husayn ibn 'Ali ul-Mas'udi was born in Baghdad towards the close of the 9th century. His major work, Muruj udh-Dhahab wa Ma'adin ul-Jawahir (Meadows of Gold and Mines of Precious Stones), is an historical work, which he completed in 947. In 956 he finished a second edition, making the book double its previous size, but no copy of this latter edition seems to be extant. The original edition has been published at Bulaq and Cairo and with French translation by C. Barbier de Meynard and Pavet de Courteille (9 vols. Paris, 1861) See all the sources at www.g4g4.com/MyCD5/SOURCES/SOURCE3.DOC !
  • Page 396: Twins paradox. Maybe mention that "true reason" is due to acceleration / deceleration (higher energy states) needed for travailing twin in order to return, since during the constant speed travel, traveling twin would see twin on Earth aging slower, since Earth is moving away. This is general relativity topic of course.
  • Page 396: Sentence on 1st paragraph: "The price of the retained youth is, however, that everything around one changes very much more quickly than if one is at rest with the environment." indicated that there is a special frame of reference namely "environment". It should be change to point out that there is no fixed "environment", just different frame of reference. That is from a point of few of falling muons the people are terribly slow creatures.
  • Explain in more detail the working of a gravity wave detector (by CH).
  • Structure the sections into a minimal and an extended program (by SV).
  • It is said that butterfly effect does not exist due to friction and dissipation. True, but requires substantial rewriting and explanations.
  • The statements about Redondi's book and the newest research results on the trial have to be corrected and updated. Several are incorrect. (CS: done in new version)
  • Concepts are invented - particles in classical physics only approximately correspond to particles in quantum mechanics. (CS: can you say a bit more about what you mean?)
  • The maximal power/force concept is poorly explained. It is unclear why two black holes can't evaporate simultaneously to produce a twice larger power. (CS: the power addition paradox is addressed in the text; essentially, the two pulses cannot overlap, but must come after each other, so that the power does not add up) What is the power of all stars in the universe? Is it larger than this c^5/4G limit? (CS: no, it is lower; but probably it just saturates it.) The explanation of the maximal force also has a drawback. Namely, the statement "to produce a force exceeding the limit value, we need to store large (elastic) energy in the rope" is false. If the rope is unstretchable, by pulling on both sides one performs no work and therefore stores no elastic energy in the rope. Only because absolutely rigid bodies don't exist, the rope will store some elastic energy, but the amount of this energy depends on elasticity of the rope (how much it extends when pulled with some force). Therefore this piece of argument as presently stated is wrong. (CS: Thanks, I will rephrase the argument.)
  • A comment on your remark above that the power of all stars in the universe probably saturates the power limit. If this is true, then there should be strange cause-and-effect relationships happening. Indeed, if some extra power source like a supernova happens in our galaxy, this means somewhere else an equal amount of power should vanish in order not to exceed the limit. This means every new power source (even a small one) should wait for some power 'vacancy' in the universe. What is the mechanism of a power source "knowing" if there is a vacancy or not? From this argument I would suppose that the universe is far from the power limit. (CS: this apparent counter-argument is wrong - it is a good puzzle to find out.)

3. Suggestions for new topics and tables

  • via Ed Cryer: Add from Aritotle's Nicomachean Ethis, Book10, Chapter 7, the very end:τὸ γὰρ οἰκεῖον ἑκάστῳ τῇ φύσει κράτιστον καὶ ἥδιστόν ἐστιν ἑκάστῳ: καὶ τῷ ἀνθρώπῳ δὴ ὁ κατὰ τὸν νοῦν βίος, εἴπερ τοῦτο μάλιστα ἄνθρωπος. οὗτος ἄρα καὶ εὐδαιμονέστατος. (1178a whatever is proper to each is naturally best and pleasantest to him: such then is to Man the life in accordance with pure Intellect (since this Principle is most truly Man), and if so, then it is also the happiest.) ὁ κατὰ τὸν νοῦν βίος the life in accordance with pure Intellect - I love that phrase, especially in Greek.
  • Include what a survey found about what the young boys (B) and girls (G) want to know from the sciences:
    • how to ensure fitness (B+G)
    • about reason and meaning of dreams (G)
    • about cancer, HIV, narcotics, ST diseases, alcohol, tobacco effect, prevention, etc (G)
    • about first aid and medical equipment (G)
    • about diet, eating disorders (G) (CS: no)
    • about nuclear bomb, explosives, biol. weapons, chem. weapons (B)
    • about life outside Earth (B)
    • CD, DVD and tapes: how they work (B)
    • lasers for technical applications (B)
    • how does weightlessness in space feel (B)
    • how computers work (B)
  • Maybe add something to the section on Black Holes about Eddington-Finkelstein and Kruskal coordinates and the topology of the extended spacetime manifold?
  • Add topic on Fluid Dynamics
  • Add topic on Hydraulics
  • Add more on semiconductors
  • Add more on nuclear physics.
  • Add more on optics; add progress on optics.
  • Add more topics on mechanisms and robots.
  • Add more topics on power generation by chemical means.
  • Add more on business aspects of physics.
  • Add mechanism of finger noises.
  • Teach calculations, including fractions, including mental calculations.
  • Add polarizability of matter from 10^8 to 10^18 Hz.
  • What shines at night in a forest? (In a desert? On a mountain?) Why?
  • Introduce UV / VIS / IR spectroscopy.
  • explain fluorescence spectroscopy and fluorescence microscopy
  • explain confocal laser scan microscopy
  • explain circular dichroism
  • explain single molecule FRET
  • explain NMR and ESR, explain pulse sequences in laser spectroscopy
  • add mass spectroscopy, MALD-TOF, ESI
  • add crystallography, X-ray, neutrons
  • analytical ultracentrifugation
  • calorimetry
  • inelastic electron scattering (for biomolecules)
  • phosphorescence.
  • add more on blood circulation.
  • add a brightness table (sunlight, candle, etc.) in the main text.
  • Add universe parameters.
  • Add the free will theorem.
  • get all figure tops aligned to the text-top;
  • Write to France for the falling cat images (Musee Marey).
  • check neighborhood definition in appendix;
  • add aphorisms by Zarko Petan;
  • Add: lauschen ist rauschen.
  • Phone Füssmann at the MPI for plasma cloud movie.
  • Add escape velocity table.
  • Added refs on Poynting for trafos?
  • Mathematics is the language and backbone of sciences, and especially so for the fundimental science known as physics. It would be cool to also include some sections to introduce the concepts of mathematics, especially on space and vectors, and the different coordinate systems, DIFFERENTIAL and integral equations that is so vital to describe anything is physics in a precise manner. (CS: spaces and vectors are explained in the text already in detail; different coordinate systems will probably not be included; but I agree that more on differential equations needs to be added.)
  • Explain metal conductivity; by HD.
  • Explain superconductivity.
  • Add more on the enteric nervous system.
  • Add explanation on artificial eggs, artificial tomato, artificial shrimp.
  • Add story about the Lake Nyos CO2 disaster in Cameroon.
  • Add one of the fake terahertz images and the challenge to show why; add backscatter X ray imaging.
  • Perhaps adding a section to the expansion of the universe explaining how with bigger and better telescopes we are able to look back at light/energy from near the time of the big bang. Yet this light would have passed us billions of years ago and be far beyond the reach of any telescope. It would be like shining a flashlight into the sky and trying to use a telescope to see the beam heading away from us.
  • Clouds. (6th Jan 2008) I enjoyed your section on clouds p1244, but all the clouds you referenced were clouds of fixed objects. How does the theory stand up to clouds which exist as a consequence of a transient phase or energy level change. The cloud 'parked' on top of a mountain is a typical example. Warm air is driven up one side of the mountain until it passes above a critical point, when its water vapour is unable to stay in gas phase and undergoes a phase change to liquid which we see as the cloud. The air continues over the top of the mountain in liquid phase mode and then descends the other side of the mountain. When the air passes back down through the critical point when the liquid water is converted back into gas and the cloud stops. The cloud is static to the mountain but the air and water that constitute the 'static' cloud continually flow through the cloud itself -- the constituent particles of the cloud are transient and dynamic. What keeps a cloud together in this situation when the cloud only exists as a condition of a fluid undergoing a phase change as it passes through a standing wave? Another and even more amazing example is shown by the Nasa picture that follows. In this example the air is essentially static, and the cloud is attached to the plane travelling at mach 1. The cloud 'stays together' within the confines of the energy wave. How does this fit in with your three modes of clouds staying together? http://antwrp.gsfc.nasa.gov/apod/image/0708/sonicboomplane_navy.jpg
  • A study guide to accompany each chapter/section for those that want to learn a topic. E.G. Guided excercises for each topic, possibly a separate appendix? (CS: I'll consider it.)


4. Suggestions for better tools and design

  • Psfrag all pictures in C2A, C2C, C3G, C4E, C5A, C6Z, C11 (rest is already done).
  • Correggere le vignette per C12, C13 e C14.
  • Redesign the cover and back cover.
  • Use a professional designer for illustrations
  • Vector E (el. field): bold upright or bold italic?
  • Acronyms: how do they work in titles, in captions?
  • Use Küster’s Minion math
  • Make extra pdf for readaloud? Discuss book with blind groups.
  • Buy O Reilly ‘‘Unix power tools’’?
  • Add ‘‘Table xx continued’’ on longtables;
  • Add language to citations.
  • In sections discussing mathematics, use blackboard bold to represent number sets (i.e. use \mathbb{Z} for integers on page 793, might need the amsmath package)
  • Problem with copy-pasting from PDF version to other sources whereby ligatures (combined letters created automatically by your layout program) do not appear when pasting. Also, copy difficulties when reader highlights margin text as well as paragraph text (esp. in Preview on Mac OSX) (CS: this will be corrected in the next version.)


5. Translations

  • A preliminary version of the chapter on special relativity is available in Spanish, as result of the work of José Manuel López López. If you want to continue translating it, get in touch, to avoid that sections are translated more than once,
  • A preliminary translation into Italian of the beginning of the book, from the Preface to the Acknowledgements, was prepared; in wait for prof. Schiller's answer to publish it.
  • Other language candidates:
  1. Italian - several requests, one translator started the chapter on special relativity,
  2. Russian - one proposal and many requests, status unclear,
  3. German - no translator yet.
  • Can you help 30 minutes and translate the welcome web page into your own language? Many languages are still missing!
  • I imagine that translations are driven by the availability of willing translators more than anything else but, if one were to target languages by the number of speakers, one would maximize the percentage of the world's population that had access to the book. There seems to be some debate about the precise ordering of languages by number of speakers but those with more than 100 million look to be Mandarin, Spanish, English, Arabic, Hindi, Portuguese, Bengali, Russian, and Japanese. (CS: thank you!)

The presently available version is version 21, of December 2007. The following are suggestions that will be added in version 22 or that will not be worked in.


Suggestions already worked into the forthcoming version 22

  • Page 927, 1st para. "Since action is a measure of change, a minimum observable action means that two successive observations of the same system always differ by at least ħ. ... all the atoms and electrons are continually buzzing around." The reader may wonder whether the minimum observable action is a property of the observed system or merely arises from the process of observation. A traditional argument (de Broglie's?), at the level of particles "buzzing around", is that the observer interacts with the observed system by observing it, at a minimum sending a photon whose wavelength L corresponds to the position uncertainty of the observation and whose momentum is h/L, thereby disturbing the observed system by order h. 'Quantum theory' says that, even so, the action uncertainty is inherent in nature. The electrons (etc) are just around, not buzzing like flies. This doesn't come out until p932 with the use of the term "indeterminacy". As this has been understood for decades (and was also mentioned in footnote p270), why not enlighten the reader at the start, for instance by introducing electron diffraction? (CS: because that paragraph is on the effects of hbar on *rest*; diffraction comes a few pages later.)
  • Page 360, Challenge 492: Maybe to add that constant flow yields shrinking of stream as it falls (observable with any tap), since the speed gets larger. For longer funnel the speed throughout hole pipe is constant and equal to exit (constant flow yield constant velocity of fluid), thus there must be a drop in pressure inside the pipe (p/ρ+gh+v^2/2=const). We can also think of this smaller pressure (compared to atmospheric one) to be responsible for faster suction of water in the container. (CS: good point, I'll add the suction topic.)
  • Page 360 (253), Challenge 508. The explanation is confusing for me (first two sentences and its relation to the problem). (CS: I'll improve it.)
  • Page 1115, "Microscopic evolution can be pretty slow": the champion of long-lived metastable nuclear isomers is of course tantalum-180m, with a half-life above 10^15 years. (CS: Is already in 2 tables; I'll add it there as well; but Bi 209 is even slower: 10^19 years!)
  • Have you thought about a pared down version of the book targeted to children (in homeschooling families, for instance)? (CS: yes, but I have abandoned the idea - I like more to write for the present target group)
  • Have you thougt to offer every single subchapter (1-42) as a downloadable pdf-file ? I'm surfing by modem and even the download of one of the six parts takes hours. (CS: I have to think about this, because the administration would be very time-consuming.) In the meantime I downloaded the first three chapters (a download of the whole book ended after 3 hours with an error message). It took long time, but it worked well. So I agree with you, you better continue working on the text instead of administration issues.
  • The Butterfly Effect. Like one of the previous posters who made comments into the 'Hate' page, I have a problem with your position quoted on page 286 : "Even though nonlinearities do indeed lead to growth of disturbances, the butterfly effect has never been observed; it does not exist." My problem does not in any way warrant a 'Hate' but I do have a problem both with your assertion that the effect does not exist and with your position which seems to infer that it does not exist because it has never been observed. I understand your case that perturbations are more likely to be subject to dampening forces and to die out rather than to rage in positive feedback into, for example, a tornado. While this thinking is totally correct it is not the right way to interpret the butterfly effect. Instead, you should think of the tiny initial perturbation - the flap of a wing, the fall of a grain of sand, the tiny spark from a flint - as a trigger. By itself a trigger is a meaningless event. Without a weather system primed with energy, the first swirl could not trigger the tornado. Without the unstable collection of mountain rock, the falling grain of sand could not trigger the landslide, and without a forest full of fuel, the spark could not ignite a forest fire. By itself a butterfly cannot CAUSE a tornado, but in a primed system waiting for a trigger, then it can certainly trigger the event. (CS: No, it cannot.)
It is self evident that a major event is triggered by some preceding smaller event, and that smaller event by some even smaller event, all amplified by the positive feedback from a system primed with potential energy - everything from a war to an earthquake, from an avalanche to a tornado. (CS: no, that is not correct)
Systems that have acquired an imbalance of energy, be it air laden with water vapour or rock under huge shear pressure in a tectonic fault, can relieve their imbalance through two routes, diffusion or catastrophe (or of course any number of intermediary combinations of these two). Provide no more energy is fed into the system, or a catastrophic trigger is not provided, the energy in a weather system will diffuse away into the surroundings and the pressure in the rocks will relax as the rocks flow like glass. But if the energy is in that system and an appropriate trigger occurs, then the catastrophic feedback occurs releasing the energy in either a devastating storm or earthquake.
The flap of the butterfly wing did not cause the tornado all by itself, it did not whip up all the energy of a tornado from nothing, no, it was the tiny trigger in the right place at the right time in an appropriately primed weather system that was magnified by the positive feedback mechanisms of that system into becoming the tornado. Don't forget, just about any spark in a forest full of fuel can trigger a forest fire and likewise, just about any butterfly wing flap or other tiny initial perturbation could trigger the tornado, but there has to be a trigger somewhere, and the point is that it could just as easily be the flap of our hypothetical butterfly! (CS: No, a butterfly flap cannot trigger a tornado, whether you believe it or not.)
If you have not already done so, might I suggest a look through the numerous books by Mark Buchanan on Tipping Points and The Power of Networks. (CS: these books are not about physics - using their ideas to describe motion would be a gross violation of reason and the scientific method.)
  • Tried Aquamacs (Emacs for mac)?
  • Learn to use convert from imagemagick to convert from animated gif to mpeg; do it with ‘‘atom in box’’.
  • Ask Heiko Oberdiek about Java applets in pdf.
  • Ask Klaus Höppner (Dante head) about his talk on javascript and animations.
  • Cmap for dvips needed (acrobat does not find ‘‘flower’’)! (See MinionPro.sty's documentation on what to do) CS: the manual says to use \input glyphtounicode and \pdfgentounicode=1, but if I read the manual correctly, this is not possible in the pdflatex -> dvips -> ghostview route which this text uses? Or is it possible now?
  • Learn how to allow comments in pdf file: with Acrobat Professional. Need to buy it.
  • Decide between pdftex (better quality, no eps but jpg figures, no pstricks, no raw postscript, no psfrag but pdffrack and unpsfrag) and dvips (no cmap, by Vladimir Volovich)
  • Consider hardcopy readers (it's tough to read from a screen for hours on end). Printing would be considerably speeded (and use less paper) if there weren't so much whitespace on each page. Maybe a double column layout with narrow margins? (CS: not for the moment)
  • Consider producing an e-reader version, Sony Reader, Irex's Iliad. (CS: I did, but the demand is too small yet.)
  • Could you perhaps produce a PDF of a single chapter with size 88.184mm x 13.854mm or 13.854mm x 88.184mm for testing on a sony reader? (CS: this is very low on my priorities, sorry.)
  • In the quote from Macbeth at the start of chapter 42--"Throw physic to the dogs; I’ll none of it."--"physic" refers to medicine. (Perhaps this is intentional but it may appear to some as though it were a mistake.) (CS: yes, it is intentional.)
  • Just a quick question. What do you think about Garret Lisi's work using E8 as start point. Seems he is definitely shaking up physics in a very cool way. Your book is terrific BTW. I posted a short article about in in www.byondrealtime.com. Have learn a lot reading it. R. Moran (CS: first impression: Gisi's work does not seem to answer any of the open questions of physics that are listed in the chapter "Quantum physics in a nutshell")


The presently available version is version 21, of December 2007. The future version 22 is in work; it is not available yet. Below are suggestions that have already worked in.


0b. General

  • Don't bother zipping a PDF, which is already compressed. The ~7% reduction in size does not offset the complexity of having to manually un-zip it, not to mention peope who don't know how to do that or don't have the proper tool. To maximize readership, don't put obstacles in their way. But it is large, so next to the link you should probably suggest that people download it rather than just click on it to open it in their browser. (CS: Both options are now available.)


1b. Suggestions for new images and films that have already been included in version 21

  • Add more pictures of machines (maybe in a separate section; e.g. paper mill, coal digger, tiny machines)
  • Film of Foucault's pendulum: there is an animated GIF in wikimedia commons (open source media): Foucault's Pendulum (CS: thank you, added link in version 21)
  • Add photo of deformed tennis ball during impact (CS: will be included in version 21)
  • Add photo of sun dogs or the like (CS: will be included in version 21)
  • Add galaxy image (CS: will be included in version 21)


2b. Suggestions already worked in version 21

  • Change square root signs (CS: no)
  • Typography: Make brackets have the right size to contain their content. (E.g. using \left( ... \right) or \Bigl( ... \Bigr) etc.) (CS: where exactly?)
  • Add more problems; not just the conceptual kind, but more practical world problems (CS: please specify your favorite topics for which you want this!)
  • Why is it true? You may like to answer this question in the textbook: Why do people consider the theories in this book true or false? I think this would really help... Thanks. (CS: The reason is: agreement with observation. There is already a section called "What is a lie?" that answers this in more detail, together with the sections before and after it. Enjoy.)
  • Chapter 1 needs more material on biology and scaling. (CS: will be added in version 21)
  • More topics for engineers! (CS: more will be part of version 21)
  • Transform the whole book into a wiki? (CS: no plans: picture rights issues, typography issues, amount of work)
  • Amend story about origin of the equal sign (CS: will be corrected in version 21)
  • Page 23: The concept of 'soul' is a bit obscure at best and people might get the wrong idea about psychologists. Even though I understand that it is about wetting peoples appetites, perhaps an equally enthusiastic word such as 'mind' would be more appropriate? Moridin 18:03, 13 August 2007 (CEST) (CS: Agreed; will be changed in version 21.)
  • Page 143: Mention new classification group: "dwarf planets" and maybe include dwarf planet Eris, which is larger than Pluto (also dwarf planet). (CS: Thank you, will be added in version 21.)
  • Page 153: Should include viscous term (linear in velocity) in air resistance. (CS: Thank you, will be added in version 21.)
  • Page 820: separability is not clearly defined, and clashes with separability definition in rest of text; by Daniel Huber (CS: will be stated correctly in version 21)
  • Page 1043: energy dependence and limit is not well explained. (CS: will be improved in version 21)
  • Page 1267, Challenge 298: At full Moon and new Moon, the Sun, Earth and Moon are lined up, producing the higher than normal tides. Thus there is correlation between Moon phases and the gravity effects (although not causal). Maybe the question should be reformulated. (CS: Thanks! The question will be reformulated in version 21 to make clear that it was about effects on humans only. Tides have never been detected on human bodies.)


3b. Suggestions for new topics and tables that are already worked in version 21

  • Add more topics on music. (CS: will be included in version 21)
  • Make extra pdf for BW printing? (CS: NO - I recheked the figures on my printer)
  • Add more on sport, the human body, and the senses. (CS: will be included in version 21)
  • Add chapter, why vacuum tube guitar amplifiers sound better than transistor solid state amplifiers to guitar player ears (CS: see also wikipedia tube sound)
  • Add tables for light intensities (CS: will appear in version 21)
  • Artificial and computer intelligence (CS: some aspects mentioned in the section on the brain; more will not be added; too far from the topic of the text and from the expertise of the author)
  • Add Daniel Hawkins's solution to the car parking problem. (CS: will be included in version 21)
  • Add ‘‘Nr Page caption’’ in both appendices in subsequent pages. (CS: not needed in version 21)
  • Quotes at the beginning of sections could be accompanied by english transations (CS: which one did I forget?)
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