LONDON – Amy Powney, longtime creative director of Mother of Pearl, is stepping down, with plans to launch a sustainable women's clothing brand called Akyn. Powney said that as creative director ...

Mother-of-pearl is the hard ... South Sea pearl-shells are common, with white edges. The beautiful dark green pearl-shells called ear-shells or sea-ears, are more concave than the others, and ...

For the fourth year in a row, iridescent clouds of frozen CO2 are lighting the Martian sky. The clouds appear in the same place, at the same time of year.