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Buckminster would be proud Nov 2022

  • khoitsma
  • Concept, General, Kids (middle school and up)
  • 0 Comments

… maybe

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Rechnen, Multiplizieren und Addieren Nov 2022

  • khoitsma
  • Kids (middle school and up), Mathematics, Mental Math
  • 0 Comments

Sum the numbers — let me count the ways

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Florida International University (FIU) pedestrian bridge collapse

  • khoitsma
  • Engineering, General, Science
  • 0 Comments

So many ways to have avoided this catastrophe

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Lithium Batteries Oct 2022

  • khoitsma
  • General, Science
  • 0 Comments

Not everything, but some of what I wanted to know

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Easy Section Properties for Array of Points © Oct 2022

  • khoitsma
  • AISC, Concept, Engineering, Mathematics, Steel Detail
  • 0 Comments

Based on finite calculus


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Vasily Arkhipov — Hero

  • khoitsma
  • General
  • 0 Comments

Arkhipov was a Soviet naval officer credited with preventing a nuclear torpedo launch during the Cuban Missile Crisis



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  • Cantilever with a Concentrated Load at any Point — Castigliano’s 2nd Theorem Feb 2025

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What is the most general equation for the area of a triangle?
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Surprises found in the arbelos (1954)
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Circle Theorems
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