then and now

then and now
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Storyboard Text

  • ahh, we need to fix the crack in our building.
  • we need to make something to fill it in that is more stable. 
  • how about we mix some lime mortar, aggregate pozzolana, water, and stones.  this should make a stronger concrete than previously used before.
  • now we get our materials in bundles from factories where they are made by machines and other people. 
  • we take our materials to a job site where we do construction. for example, we build houses. 
  • this is our final product and it all started in a factory. 
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