Anthropogenic (combustion-derived) nanoparticles of magnetite, a strongly magnetic mineral, have been discovered to be lodged in human brains — and scientists think these tiny particles could be a possible cause of Alzheimer’s disease. Transmission electron micrographs of brain thin sections, identifying two distinct types of magnetite morphologies: rounded particles (left) and angular particles (right). Image credit: Barbara A. Maher et al,...
