Comments on "A gravitational shielding based upon ZnS:Ag phosphor" and   "The gravitational mass at the superconducting state"
  This is a discussion of two recent papers by De Aquino [physics/0112081 (2001) and physics/0201058 (2002)] that put forward an explanation of observations of gravity shielding originally reported by Podkletnov and Nieminen [Physica C 203 441 (1992)]. 
R.C. Woods (Department of Electrical and Computer Engineering, Iowa   State University)