Dr. Crockett Grabbe of the Dept. of Physics, University of Iowa, has challenged NIST in his latest paper: Response to NIST on Energy and Momentum

ABSTRACT

NIST, in their latest Answers to FAQs, artfully dodges the important issues on the physics of conservation of energy and momentum in the collapse of the World Trade Center Towers and Building 7. These issues and their unmistakable implications are addressed.

READ the full paper here: http://journalof911studies.com/letters/g/GrabbeToNISTenergyMomentum.pdf