CALCULATIONS SAY AT LEAST 14 TONS OF HIGH EXPLOSIVE NEEDED TO BRING DOWN EACH WTC TOWER.

 air, assuming water vaporization sink, building, building performance assessment report, c.  the, c. second, c. therefore, cloud, clouds, collapse, concrete, david handschuh, dust, dust cloud, energy, expansion, gases, h.  if, h. this, heat, ignoring water vaporization, j. hoffman, jerry russell, jim hoffman, k.  summarizing, k. certainly, k. that, lower manhattan, moles, n.  here, n.  now, n. we, new york daily news, north tower, on september, park place, paul j. lioy, post office, r.  estimates, required, sink, south tower, temperature, tower, trust building, v. i. lenin, vaporization, volume, water, which energy sink was dominant, word financial center buildings, world trade center