that we can to a large extent all cover the cost motahara mehrabi of sedava and sima news agency heshgaran has created a new pharmaceutical approach that uses nanoparticles and can release anti-cancer drugs to treat brain tumors in children , and to science daily news site, this technology allows the delivery of more anti-cancer drugs to places it provides specific protection for brain tumors in such a way that the normal areas of the brain that could not be treated remain intact. the final result of this is to improve the efficiency and reduce the toxicity of anti-cancer drugs . the results of new studies by researchers show that no one is safe from air pollution and 99% the world's population breathes farm air, according to the news site, based on a study by researchers, only one thousandth percent of the world's population lives in areas that have low levels of harmful air pollutants. according to researchers , air pollutant particles that are 30 times smaller than a swimming grain they can easily enter the lungs and bloodstream and cause problems such as lung cancer and heart diseases.