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Previous research has found associations between exposure to PM2.5 and maternal and child health complications including preeclampsia, low birth weight, and developmental delays in early childhood.

"This is especially important for potential health and fitness outcomes, because when you're young, you rely on your generalized immune system. Your adaptive immune system has not yet developed."

He said this has vast implications for everyday electronics, explaining how information encoded in an electron's properties could be transferred without loss, conceivably resulting in lower-power, highly efficient transistors.

"Designing materials that are compatible with hairy skin has been a persistent challenge in e-tattoo technology," Lu says.

The president’s claim that the cases were politically motivated — which his son’s camp has long asserted — has been met with skepticism from some corners.