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Photograph of boys and girls working in a classroom
© monkeybusinessimages/iStockphoto

During development, hormones guide the processes that underlie the normal formation and functions of our bodies. Boys’ and girls’ different hormonal backdrops mean they may differ in their vulnerabilities to endocrine-disrupting chemicals. The authors of a new paper propose a method to address this issue when designing studies.


Exceptionally high pre- and postnatal exposures to fluoride have been implicated in several adverse health effects; less is known about risks at exposures typical of the general population. A new study reports that high-typical levels of fluoride in mothers’ urine during pregnancy were associated with lower cognitive and IQ scores in their children.


Photograph of an uncomfortably hot man sitting outdoors
© Stefano Guidi/Shutterstock

Scientists have linked heat waves to adverse health effects and premature deaths. But while most studies of heat waves and health have been conducted in a single city or region, not all locations experience heat the same way. This new study was the first to compare the effect of heat waves on mortality across the globe.


From a size standpoint, engineered nanoparticles are identical to ultrafine particles in ambient air, but differences in the origin and potential chemistry of the two groups of particles have sent investigators down separate paths of inquiry. New knowledge-sharing opportunities may help bolster understanding of both types of particles.

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