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Meanwhile , astrophysicists are further motivated to improve the accuracy of their models of the solar interior , in order to sharpen their predictions of the neutrino fluxes and help particle physicists to disentangle between several neutrino oscillation solutions . Meanwhile , experts warned that more than 300 million rural Chinese lack clean drinking water since most waterways are fouled by industrial effluent , untreated sewage and runoff of agricultural chemicals from fields . Meanwhile , witnesses said that Israeli helicopters had fired two missiles into Beit Hanoun , an area in northern Gaza , injuring several people , one critically . Meanwhile , chemicals enter commerce at an average rate of 700 new chemicals each year . Meanwhile , psychologists Linda Acredolo and Susan Goodwyn from the University of California-Davis found that by age eight , children who had been taught to sign as infants scored a staggering 12 points higher on IQ tests .