I do believe that Wi-Fi free schools will be much safer places for the children.  No doubt, long term exposures and high levels of RF can obviously cause detrimental effects. By the way, it is a pleasure for me to be among the signers.  

Javad  SMJ Mortazavi, Ph.D

Professor of Medical Physics
Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC) 
Head, Medical Physics & Medical Engineering Department
Head, Shiraz University of Medical Sciences, Iran

National Association for Children and Safe Technology

SMJ Mortazavi, PhD