The Curious Engineer

All blogs / Science

arachnoid.com

arachnoid.com

A site for people who think. Intellectual resources, programming, astronomy, science, mathematics, Java/JavaScript applets, programming instruction, home of Arachnophilia.

ScienceSoftware / engineering practiceMathElectronics

’00’05’10’15’20’25
Posts
372 from 7 Aug 1996 to 24 Feb 2026
Posting
now and then (2 in the last year)
Kind
personal blog
Feed
https://arachnoid.com/feed.xml

2026 2

  1. SolveSpace: 3D Printable Waterproof Cup
  2. 3D Printing for Builders: 3D Printing for Builders

2025 7

  1. Resource Central for the Prusa Core One
  2. TankCalc
  3. Introduction to Statistics
  4. Consumer Angst
  5. If I Were In Charge
  6. Biography — Paul Lutus
  7. Computer Aided Design

2024 15

  1. Psychology and Neuroscience
  2. Unicode Character Search
  3. Wp login
  4. arachnoid.com
  5. Xmlrpc
  6. IcomProgrammmer II
  7. Message Page
  8. Anycubic Kobra Max: Be Careful
  9. Finance Calculator
  10. Book Reviews
  11. Software-Defined Radios II
  12. Morse Code
  13. FreeMap
  14. Jokes
  15. JTides Home Page

2023 107

  1. LaTeX Editor
  2. The Physics Behind Stopping a Car
  3. Rope Climbing 101
  4. Fire Your Stockbroker!
  5. Binocular Vision
  6. Was Thanos Right?
  7. Raspberry Pi
  8. Platonic Solids II: Edges and Faces
  9. Platonic Solids I: Vertices and Edges
  10. A Virtual Bird
  11. Creating Drone Images and Panoramas
  12. Coronavirus Math
  13. Climbing (old version)
  14. Alaska 2017: 1. Bainbridge Island
  15. Introduction to Calculus
  16. Introduction to Calculus
  17. Introduction to Calculus
  18. Introduction to Calculus
  19. Introduction to Calculus
  20. Introduction to Calculus
  21. Introduction to Calculus
  22. Introduction to Calculus
  23. Introduction to Calculus
  24. Introduction to Calculus
  25. Tracking the James Webb Space Telescope
  26. AI Image Generation
  27. Bumperstickers
  28. TankCalcAndroid
  29. Signal Processing Workshop
  30. Word Game
  31. Home Assistant / Insteon Rescue
  32. I Dumped Insteon
  33. Master index — arachnoid.com (no DHTML)
  34. My Favorite Websites (no DHTML)
  35. Master Index — arachnoid.com
  36. My Favorite Websites
  37. Section 3. JWST Lagrange Orbit Analysis
  38. Section 2. Programming/Language Issues
  39. Software-Defined Radios
  40. The Right to Choose
  41. Introduction to Jupyter
  42. Gravity and Energy
  43. Simple 10 MHz Frequency Standard
  44. Section 1. Computing Gravity
  45. For Example ...
  46. Consumer Loan Calculator
  47. Polynomial Regression Data Fit
  48. Orbital Dynamics
  49. Physics / Conservation of Energy
  50. WeatherReader
  51. User inquiries about TankCalc
  52. IPython: Math Processor: 2: Installation
  53. Blender Distributed Network Rendering
  54. Blender Graphics: Make a Planet
  55. Blender Graphics: Lenses and Optics
  56. Polynomial Regression Data Fit (Java version)
  57. Peak People
  58. Mandelbrot Set
  59. The Mathematics of Population Increase
  60. Equities Myths
  61. Everything You Know is Wrong
  62. The Idea Carnival
  63. Why Science Needs Theories
  64. Sloped Bottom Tank
  65. Storage Tank Profiling
  66. SignalGen
  67. Asperger's By Proxy
  68. Understanding Phase-Locked Loops
  69. Gravitation Description and Equations: 03. Power, Energy & Gravity
  70. Gravitation Description and Equations: 05. Orbital Mechanics
  71. Gravitation Description and Equations: 06. The Pendulum
  72. Gravitation Description and Equations
  73. Gravitation Description and Equations: 02. Force & Weight
  74. Gravitation Description and Equations: 04. Ballistics
  75. Electric Duet
  76. Eclipse 2017
  77. Building Science
  78. Binomial Probability
  79. Area of an Irregular Polygon
  80. Answers
  81. Alaska 2015: 1. Aerial Photospheres
  82. Alaska 2013: 3. Tides and Currents in Channels and Bays
  83. Trigonometric Relations
  84. TankProfiler
  85. TankProfiler Case History
  86. TankFlow
  87. Volumes In Depth
  88. JavaScript Signal Generator / Spectrum Analyzer
  89. Sangean ATS-909X
  90. PLSDR
  91. Snell's Law Calculator
  92. JSigGen
  93. IPython: Math Processor: 9: Tips & Tricks
  94. IPython: Math Processor: 6: Normal Distribution
  95. IPython: Math Processor
  96. IPython: Math Processor: 3: Getting Started
  97. IPython: Math Processor: 8: Fourier Transforms
  98. IPython: Math Processor: 5: Equation Solving
  99. IPython: Math Processor: 4: Equation Processing
  100. IPython: Math Processor: 7: Differential Equations
  101. BiQuadDesigner
  102. Physics / Relativity
  103. Transitions
  104. JNX
  105. FreeMap: The Map
  106. Solar Computer
  107. Satellite Finder Online (JavaScript)

2022 31

  1. Lake Powell Water Levels
  2. Lake Mead Water Levels
  3. Lake Mead Water Levels
  4. Expertly Dysfunctional
  5. 00: Adventures in Ray Tracing: 00: Adventures in Ray Tracing
  6. 00: Adventures in Ray Tracing: 13: Virtual Telescope II: Cassegrain
  7. 00: Adventures in Ray Tracing: 07: Changes to the Interior of Objects
  8. 00: Adventures in Ray Tracing: 97: Anaglyph Generator Perl Script
  9. 00: Adventures in Ray Tracing: 03: The Process of Image Creation
  10. 00: Adventures in Ray Tracing: 11: Anaglyphic 3D
  11. 00: Adventures in Ray Tracing: 04: Orientation in POV-space
  12. 00: Adventures in Ray Tracing: 99: Full-Size Title Image
  13. 00: Adventures in Ray Tracing: 12: Virtual Telescope I: Galilean
  14. 00: Adventures in Ray Tracing: 08: Constructive Solid Geometry
  15. 00: Adventures in Ray Tracing: 10: Animation
  16. 00: Adventures in Ray Tracing: 09: More about lenses
  17. 00: Adventures in Ray Tracing: 06: Some enhancements
  18. 00: Adventures in Ray Tracing: 05: A First Image
  19. 00: Adventures in Ray Tracing: 02: The Basics
  20. Android application Privacy Policy
  21. 3D Photosphere Viewer: 3D Photosphere Viewer
  22. How Does It Feel?
  23. Lake Mojave Water Levels
  24. Lake Havasu Water Levels
  25. Satellite Finder Online (PHP)
  26. Arachnophilia
  27. The Best and Worst College Majors
  28. 3D Particle Box: 3D Particle Box
  29. Why is the Sky Dark at Night?
  30. Programming Handheld Calculators
  31. Quadcopter High Line Rigging

2021 9

  1. Regular Expression Laboratory
  2. YouTube Ad Killer
  3. CarpeTempus
  4. Psychology and Neuroscience : Feedback
  5. Teleprompter Online
  6. Asperger's By Proxy (PDF)
  7. Asperger's By Proxy : Feedback
  8. Photosphere Gallery
  9. The Levels of Human Experience: 2. Delta (δ): Feelings

2020 61

  1. EasyTuner Home Page
  2. Randomness as Meaning
  3. How to Help the Crooks
  4. The Myth of Mental Illness
  5. The Doubt Factory
  6. Alaska 2010: 03. Rescuing a Big Boat
  7. Selected Replies to "A Society of Victims"
  8. The Narcissist Appreciation Society
  9. I know what science is!
  10. Autism is Real
  11. SatFinderAndroid
  12. Reader Feedback to "What is Science?"
  13. The Trouble with Psychology : Feedback
  14. Selected Replies to "Transitions"
  15. The Symmetry Principle: 4. Selected Replies to "The Symmetry Principle"
  16. Why is the Sky Dark at Night?: 10. Reader Replies to "Why is the Sky Dark at Night?"
  17. The Scientific Paradigm : Feedback
  18. Science of Mind: Feedback
  19. Restoring Mars : Feedback
  20. Where is my Data?
  21. What Do You Have Against Women?
  22. Psychology 101
  23. On Evil
  24. Not Fair!
  25. Miscellaneous Topics
  26. Mental Health and Evolution
  27. Media Studies
  28. Inappropriate Title
  29. Education
  30. Difficult Choices
  31. Reflections on Cosmology
  32. Authority in Science
  33. The Myth of Mental Illness: Feedback
  34. Is Psychology a Science? : Feedback
  35. Reader Feedback for "How to Raise the Asperger's Child"
  36. Social Narcissism Feedback
  37. Selected Replies to the article "On Believing"
  38. Selected Replies to "When Does it Become Murder?"
  39. Reader responses to "Is Mathematics a Science?"
  40. Reader Feedback for the article "Evolution"
  41. Reader Feedback for the article "The Doubt Factory"
  42. Selected Replies to "The Physics of Dark Energy"
  43. Building Science : Feedback
  44. Replies to "Boycott Microsoft"
  45. Reader Feedback for the article "Artificial Womb"
  46. Feedback to The Anti-Spam Home Page
  47. Children of Narcissus: Feedback
  48. Arachnophilia FAQ
  49. Arachnophilia FAQ
  50. Arachnophilia Revision History
  51. SSHelper : FAQ/User Feedback Page
  52. PLCash
  53. OpticalRayTracer : Feedback
  54. Psychology and Neuroscience (PDF)
  55. SSHelper
  56. Interview with an Extraterrestrial
  57. TidePredictor
  58. AnchorSentinel
  59. Celestial Navigation
  60. How to Use Secure Shell
  61. Intel NUC

2019 45

  1. Submit a Page from arachnoid.com
  2. Exploring Mathematics with Sage: 10. Polynomial Regression
  3. Science Litmus Test
  4. Round Table Corners using Graphics
  5. Exploring Mathematics with Sage: 03. Learning Sage
  6. Exploring Mathematics with Sage: 11. Terminal Velocity
  7. Exploring Mathematics with Sage: 02. Installation and Testing
  8. Exploring Mathematics with Sage
  9. Python
  10. Symbolic Mathematics Using Maxima
  11. Symbolic Mathematics Using Maxima: 08. Conclusion
  12. Home Page Builder 2.0 — Help
  13. Home Page Builder 2.0
  14. Home Automation: 4. Managing a System Controller
  15. Boycott Microsoft
  16. Alaska 2017
  17. Alaska 2009: 08. Technical Notes: Inverter/Charger Project
  18. Alaska 2008
  19. Library Database
  20. The Symmetry Principle
  21. Alaska 2007: 02. Sex Among the Bears I
  22. Be nice or we'll blow you up
  23. Is Psychology a Science?
  24. Hacking the Nokia N810
  25. Running Fedora Linux on Dell Laptops
  26. On Believing
  27. Social Narcissism
  28. Linux on Android
  29. Installing Linux on a Dell XPS Laptop
  30. Linux Base
  31. Notes and Fixes for Fedora 17
  32. Encountering Ruby
  33. SearchReplaceGlobal
  34. The Physics of Dark Energy: 03. Relativistic Cosmology
  35. Alaska 2011: 07. Electronic Navigation
  36. The Trouble with Psychology
  37. Prime Numbers
  38. Alaska 2018
  39. Alaska 2018: 01. The Day of Seven Bears
  40. Alaska 2018: 02. Two Rescues
  41. Alaska 2018: 03. An Easy Electronic Repair Method
  42. Children of Narcissus: 05. Media Portrayals
  43. World Sail
  44. Alaska Images
  45. MagicLantern

2018 18

  1. Alaska 2013
  2. Alaska 2007: 06. Collision!
  3. Alaska 2007
  4. PodcastRetriever
  5. GnuCash Utilities
  6. Reddit: Psychology is a science!
  7. Stocks and Stockbrokers
  8. A Society of Victims
  9. FFTExplorer
  10. JSQLiteClient
  11. OpticalRayTracer Technical (older, archived)
  12. The Best and Worst College Majors (PDF)
  13. Why PDF?
  14. Alaska 2014: 1. Impeller Pump Blues
  15. Children of Narcissus: 03. Narcissism
  16. Children of Narcissus: 04. Authority
  17. Children of Narcissus
  18. Children of Narcissus: 02. Baseline

2017 1

  1. OpticalRayTracer Home PageA completely rewritten virtual lens/mirror design workshop.

2011 2

  1. SearchReplaceGlobalPyA tool for applying regular expressions to large groups of files.
  2. Bash Script Beautifier (Python)A beautifier for Bash shell scripts written in Python.

2010 4

  1. Programming Icom RadiosA Ruby project that tells Icom radios what to do.
  2. PolyRegressA Python polynomial regression analysis application.
  3. RPNCalcAn RPN calculator in Python.
  4. PyBeautifyA Python source code cleanup utility.

2009 2

  1. Bash Script Beautifier (Ruby)A beautifier for Bash shell scripts written in Ruby.
  2. TankSteppedA special-case analyzer for large storage tanks.

2008 5

  1. Modeling Gravity with RubyRuby Gravitation. A Ruby program that models gravitation in real-time, as well as an article describing the physics of gravitation and computer modeling.
  2. Graphinity: Graphing in DepthA Ruby graphing and analysis program, recently rewritten.
  3. Ruby Script BeautifierA beautifier for Ruby source files ... written in Ruby.
  4. Round Container Corners using Pure CSSA Ruby script that creates round corners using pure CSS methods.
  5. The GPSMap ProjectA method to link your GPS receiver to Google Maps and Google Earth.

2007 3

  1. Secure Shell Fun and GamesUsing secure-shell transactions to improve security.
  2. Creating Music Playlists with RubyA music collection organizer written in Ruby.
  3. On Being PerfectAn analysis of narcissism and narcissists, with some real-world examples.

2005 1

  1. DBClientA Python/GTK MySQL database management tool.

2003 1

  1. Words and their MeaningsHow to decode political speech.

1996 1

  1. Did Earth's Life Originate on Mars?Article: Did Earth's Life Originate on Mars? A scientific speculation on this theory, discusses related issues.

Undated 57

  1. Android Offline Topographic MapUsing an Android device as an offline, off-road GPS/mapping resource.
  2. Android-x86 Desktop HowtoA step-by-step guide for Android kernel configuring and compiling.
  3. The Levels of Human ExperienceThis article set discusses the four primary ways by which people process their experiences.
  4. Photosphere ViewerAn index of photospheres and a spherical viewer.
  5. ExplanationA way to organize lengthy reader dialogues.
  6. An Insider's PerspectiveA School Psychologist Speaks Out.
  7. Can Psychology Ever Become A Science?A student's inquiry.
  8. Narcissism RevisitedA conversation about narcissism and self-esteem.
  9. Yes, but ...A psychology undergraduate speaks out.
  10. Home AutomationHow to control your house with a computer.
  11. Are You Overweight?Are You Overweight? Online, interactive JavaScript application.
  12. Big Digital ClockA precise, convenient clock display.
  13. New World ClockJavaScript World Clock. 24 simultaneous time zones updated in real time.
  14. Unit ConversionsA comprehensive, interactive JavaScript unit conversion utility.
  15. Virtual CalculatorVirtual Calculator — interactive JavaScript application
  16. Bash Shell Programming in LinuxHow to write labor-saving shell scripts in Linux.
  17. Consistent Network Device NamingAnother Linux kernel conceptual breakthrough (and how to repair it).
  18. Controlling NetworkManagerGetting along with an important Linux utility.
  19. Dictionary access under LinuxA how-to for Linux dictionary server/client setup and configuration.
  20. Dictionary front end using PHPA handy PHP-based dictionary access method.
  21. Mobile Internet Access Using LinuxConfiguring a cell phone to work as an Internet data modem.
  22. Did Earth's Life Originate on Mars?A speculative slide set on a topic that is still controversial.
  23. ScienceA graphic slide set on the topic of science.
  24. The Idea MarketplaceA graphic slide set that discusses how ideas are processed and marketed.
  25. Computer mathArticle: Computer math — a description of the changes in math training and practice brought about by the computer.
  26. Creative Problem-SolvingArticle: Creative problem-solving. Practical advice with some real-world examples.
  27. How we confuse symbols and thingsThis article discusses some educational and general social aspects of western society.
  28. The Anti-Spam Home PageAn updated history of spam and spammers, analysis, suggestions for remedies.
  29. The Magic Looking GlassArticle: The Magic Looking Glass. Discusses developments in virtual reality.
  30. Why are computers so hard to use?Article: Why are computers so hard to use? Discusses history, current technology, consequences.
  31. Networks Of SleazeAn analysis of online advertising, including a true, first-person account by a victim of online fraud.
  32. Reciprocal LinkingA detailed look at yet another sleazy Internet practice.
  33. The Artificial WombIf you didn't see this coming, you haven't been paying attention.
  34. When Does it Become Murder?An analysis of capital punishment.
  35. Why don't books have advertising?A discussion of bound books as a last holdout in a world filled with advertising.
  36. Restoring MarsA strategy to prepare Mars for human colonization.
  37. HTML for the Conceptually ChallengedA very basic tutorial, plainly worded, for people who hate to read instructions.
  38. How to Raise the Asperger's ChildNo magic, just common sense.
  39. Science of MindPsychological study and practice, past and present.
  40. The Scientific ParadigmAn essay on the structure of science and pseudoscience.
  41. Alaska 2002The article set for the 2002 Alaska expedition.
  42. Alaska 2003The article set for the 2003 Alaska expedition.
  43. Alaska 2004The article set for the 2004 Alaska expedition.
  44. Alaska 2005The article set for the 2005 Alaska expedition.
  45. Alaska 2006The article set for the 2006 Alaska expedition.
  46. Alaska 2009The article set for the 2009 Alaska expedition.
  47. Alaska 2010The article set for the 2010 Alaska expedition.
  48. Alaska 2011The article set for the 2011 Alaska expedition.
  49. Alaska 2012The article set for the 2012 Alaska expedition.
  50. Alaska 2014The article set for the 2014 Alaska expedition.
  51. Alaska 2015The article set for the 2015 Alaska expedition.
  52. Alaska 2016The article set for the 2016 Alaska expedition.
  53. Ruby Howto: Graphical User InterfaceHow to design a GUI interface for your Ruby program..
  54. EvolutionWhat we can learn from biology's most important theory.
  55. The Physics of Dark EnergyAn exploration of a recent discovery in cosmology.
  56. What is Science?An earnest exposition.
  57. Trapezoidal Storage TanksTanks with sides that are straight but not parallel.