The nature of electrostatic charges produced at the surface of insulators by rubbing is the subject of a long-standing discussion. The charges created on polytetrafluoroethylene by rubbing with polymethylmethacrylate are identified here to be electrons rather than ions.
AP - The plan was nothing if not audacious: A turncoat persuades rebels to bring together their most prized hostages and march them 90 miles through Colombia's wilderness. A month later, disguised commandos primed with acting lessons land in a helicopter and trick the rebels into handing them over.
Reuters - The investigation of a salmonella
outbreak in the United States is shifting to the southern
border to encompass produce imported from Mexico, CNN reported
on Thursday.
