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This is the alarm launch on the British review “The Lancet”, from the investigators of Harvard School of Public Health di composed from 202 voices but up to now not exaustive Boston who have stilato the black list of the potentially toxic substances. It is estimated in fact that approximately a child on six it has a disturbance of the development, nearly all regarding the nervous system. The presence disturbs of the nervous system is not accidental, must to the fact that, sin from the fetal development until all the adolescence, the brain is particularly vulnerable. The polluting agents acclimatize them of industrial derivation above all are very many but up to now of little they have been only given sure on their injurious effects for the health and however it has been always neglected the issue of the exposure to low doses that can above all cause serious problems of health for smallest. That can favor the appearance of disturbs of the behavior like the hyperactive syndrome from and deficit of attention (ADHD) or neurological diseases like the autismo, or can determine of the changes in intelligence of the child. Of it is exited a list of 202 substances but, the experts, studies perceive on animals demonstrate that this list could catch up the three figures, with the result that million children in the world are today “unaware of victims” of a silent epidemic. Unfortunately the job to make is still a lot in order to safeguard the health of the children: it must adopt the principle of precaution for which every chemical substance it goes rigidly restricted and, if later on of it only demonstrates the innocuità, the regulation can is made tightening less. This approach is begun to use in Europe but still it is underrated in the USA. also where the toxicity is documented like for the first five composed ones in the list (metil-mercury, PBC, lead, arsenic) adequate regulation is not taken part with one. On lead and mercury there are only of the rules times protect smallest, for the others 200 in the list, you notice toxic agents for the brain, does not exist some regulation to child measure. It is spoken therefore about a silent epidemic because draft of subclinici problems but its impact is enormous: deficits of cerebral development mean tomorrow reduced ability (and therefore productivity) for the adults. “The brain of our children is the more precious resource economic who we have must adopt initiatives of public health that the protect”.