This science examination shows that no nuclear weapons of any size, only explosives were used to destroy WTC building one. There is false controversy claiming some types of nuclear weapons were used. No factual evidence has been shown to support those claims. This magazine issue provides clear technical evidence showing no nuclear weapon was used. In addition, the technical details provide engineering analysis of nuclear weapons types and how they could not work. Historical evidence on the WTC ONE 1993 attempted demolition is examined and compared. Sample types of nuclear weapon and sizes are examined and compared demonstrating why no nuclear weapon would work, providing clear evidence. Simple Mechanical engineering technology is used in the analysis that anybody can follow.