Federal officials in New Jersey have seized two separate shipments of so-called "gas station heroin" imported from Hong Kong ...

Ball bearings may have a very slight deviation in dimensions from ... Polytetrafluoroethylene (PTFE) seals are connected to the bearing by a groove in the outer raceway. It provides a reliable barrier ...

To some clockmakers, this is a shame, as the escapement can be an elegant and mesmerizing piece of machinery, so [Brett] brought his rolling ball escapement to the exterior of this custom clock.

The mating bearings run along either the groove or tongue, providing high rigidity. There are two main types of spline shafts, those manufactured for plain bearing spline bushings and those machined ...