Jeff Prager's Blog (1)

In order to cause concrete and steel to turn to micron-sized (and smaller) dust particles at Ground Zero as presented by Dr. Thomas Cahill, UC Davis Delta Group, the speed of sound must be reached in those items. Dr. Cahill is one of the worlds premier nuclear atmospheric physicists and came to NY to perform atmospheric testing based on a government request.

 

The speed of sound for concrete is 3200-3600mps (meters per second) and for steel the speed of sound is…