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WARNING:Holdingacellphoneagainstyourearorputtingitinyourpocketmaybebadforyourhealth.

Thissentenceisawarningthatyou’dbetternotputitclosetoyouwhenanewphoneisbought.Applecompanyforexampledoesn'twantiPhonestocomeclosertoyouthan1.5centimeters;ResearchInMotionBlackBerry'sproducerrecommends2.5centimeters.

Ifcellphoneusecancausehealthproblemstheresultwillbeveryserious.Americansspend2.26trillionminuteschattingoncellphoneseveryyearwhichbrings$109billionforthewirelessbusinessmen.

DevraDavisanepidemiologist(皮肤病专家)whohasworkedfortheUniversityofPittsburghhaspublishedabookaboutmobilephoneradiation（辐射）"Disconnect."Davisstudieshowoftenbraincancerhappensduringdifferentagegroups.Shefindsabigincrease(增长)inbraincancerinthe20-to-29agegroupandadropfortheolderpeople.

Childrenaremoreeasilyhurtbyradiationthangrown-upsMs.Davisandotherscientistspointout.Butnostudieshaveyetbeenfinishedoncellphoneradiationandchildrenshesays.

HenryLaiaresearchprofessorbeganlabradiationstudiesin1980andfoundthatmiceexposedto(暴露在)radiofrequency（电波频率）radiationhaddestroyedDNAintheirbrains.

Ms.Davisrecommendsusingwiredearphones（有线耳机）orthephone'sspeaker.Childrenshouldsendtextmessagesratherthancallshesaidandpregnantwomenshouldkeepphonesawayfromtheirbodies.