Henry62 Was Right!
Our Italian buddy Henry62, who is probably doing the best work today in active 9-11 debunking, has heard back from NIST on the UPS issue which we discussed several months ago. His suspicion was right; the UPS in question does not stand for United Parcel Service, but Uninterrupted Power Supply. This indicates that the material flowing from the 81st floor of the South Tower, often claimed to be molten steel by the crackpots, is most likely at least partially lead from the batteries. Given that this "evidence" was cited by Graeme McQueen just the other day per Professor Shallit (see post below this one); this is a significant bit of debunking.
Complicating matters is that United Parcel Service did apparently have an office on that floor in the early 1990s, but by 1999, when the most recent modifications were made, the floor was occupied by another tenant.
Terrific job as always by Henry62!