Well, it surely has affected you since you are claiming that a non-existent pbs special aired in the 80's about the construction of the WTC towers when only 2 years prior, they had already made a special about the WTC towers. PBS doesn't waste money like that.
The 18 minute celebratory video you refer to was released in 1983.
The 2 hour documentary I viewed "The Construction of the Twin Towers" started production in 1987 and aired in 1990.
The videograpers explained that they applied for a grant, not necessarily from PBS for the purposes of documenting HOW the public money was spent, because the towers were so costly.
In the beginning they mentioned the 18 minute video that is still available and differentiated their intimate, techinical production from it.
From it I learned that the C4 coating on some of the rebar was exposed to bad weather over the winter months before concrete could be poured. The concrete contractor poured immediately as soon as it warmed enough for the concrete to cure, before it was determined that the "special plastic, anti vibration, anti corrosion coating" had become non viable.
The cost and delay was too great to remove the concrete so constrcution continued.
The reason the concrete was blown away from the
3" REBAR ON 4' CENTERS is because the horiziontal rebar tied to the vertical was fresh and it popped the concrete off the vertical bar seen in the linked image.
How would I know that if i hadn't seen the doc, how would I know that?