Scientists say ultrasmall man-made particles are toxic to animals. What about us?
By Joshua TompkinsPosted 07.04.2004 at 1:00 pm 0 Comments
In 1941, researchers at Johns Hopkins Hospital made an unsettling discovery: Inhaled nanoscopic particles could travel into the brain. When chimps and rhesus monkeys breathed air laden with poliovirus cells, some of the particles followed the path normally reserved for smell signals, thwarting the protective blood-brain barrier.