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Category: General

Prairie Home Companion Archives Feb 2022

  • khoitsma
  • General
  • 0 Comments

great shows available

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Lecture by Richard Feynman – with transcript Feb 2022

  • khoitsma
  • General, Mathematics, Science, Video
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Los Alamos from below

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The Busy Man’s Friend Feb 2022

  • khoitsma
  • General, Science
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A beautiful book
· how to add a column of numbers

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Space Exploration and How to Ruin Everything Dec 2021

  • khoitsma
  • General, Science
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I have grave concerns about science activities.

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Drone Walks and Flys Oct 2021

  • khoitsma
  • General, Science
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I like the tightrope demo; that’s out of the box.

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The Gulf Queen Collision Oct 2021

  • khoitsma
  • General
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Recent Posts

  • Lessons Learned (structural engineering) Apr 2025
  • Marimo Notebook Mar 2025
  • Fixed Fixed Beam with a Moment at any Point — Superposition Mar 2025
  • Nobel Prize winner from NSF SSTP
  • Cantilever with a Concentrated Load at any Point — Castigliano’s 2nd Theorem Feb 2025

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My Dash apps

My GeoGebra app
What is the most general equation for the area of a triangle?
The Wait calculation
The incessant obsolescence postulate (IOP)
Barnard’s Star and the 'Wait Equation'
IOP counterargument
The amazing arbelos
Surprises found in the arbelos (1954)
Arbelos from Wolfram MathWorld
Circle Theorems
• Circle Theorems Marked
• Circle Theorems — Practice
Two Semicircles
Japanese temple geometry
★ Sister Celine — a beautiful life
★ John Lienhard IV on Ingenuity
★ Charles Stutzenbaker, Field Biologist
Neal Stephenson on the OS
A few quotations

Tyler TX weather • 🌡 Steve Fitzgerald
Tyler TX weather • 3-day history
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Tyler TX weather • graph month
East Texas weather • TAMU
★ All of the water in the world

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