the school in yarmouth that year had a low opt-out rate � 2 percent, the superintendent said � so there was a cap on the amount of disruption an illness could cause. .
written reports, including local media accounts, professional medical papers and internal emails were also examined. .
"if the battery in a mechanical mod over-discharges and the device doesn't contain enough air holes to allow the battery to vent, there is a risk of explosion."
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