Mother-of-pearl is the hard, silvery ... and hence grind more quickly. If the stone be wetted with soap and water it is less liable to be clogged. The pieces are finished on the flat side of ...

New images captured by NASA's Curiosity rover show colorful clouds in the sky over Mars. The images were captured by the rover's Mastcam, which NASA's Jet Propulsion Laboratory compared to the rover's ...

Bethlehem is the centre of an industry in mother-of-pearl which supplies beads, rosaries, inlaid work, carvings, and miscellaneous ornaments or souvenirs to all parts of the world. This industry ...