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In one study, some male rats subjected to the did develop cancer tumors around their hearts. But the female rats didn’t, and neither sex suffered symptoms in another study. And then there’s the truly odd . Both newborn rats and their mothers had reduced weight but grew to normal sizes, and exposed rats lived longer than those that hadn’t. And these are at exposure rates that are “much higher” than the current cellphone safety standard, the Food and Drug Administration said.

In its comments on the study, the FDA stressed that the study didn’t translate neatly to typical human experiences beyond the exposure levels. Rats are clearly much smaller than , so they’re enduring that intense radiation across their entire bodies where a human might only deal with those levels near their ears or thighs. This didn’t include 4G frequencies, either, so any risk that was there might not have been present with an LTE connection.

Things aren’t entirely set in stone yet. There will need to be finished with outside reviews that might interpret the findings differently or prompt follow-ups. However, the early data illustrates exactly why there’s no proclamation on the safety of cellphones. Lab tests can only tell you so much, and long-term tests tend to provide ambiguous, incomplete results. These latest studies mostly imply that there’s no obvious short-term effect.



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