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1) Birthstones
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https://www.crosswordclues.com/clue/opals

OPALS (Optical Payload for Lasercomm Science) is an optical communication in outer space experiment developed at NASA`s Jet Propulsion Laboratory for the International Space Station. It will test the potential for using an optical laser to transmit data, at much higher rates than traditional space-based RF communications, to Earth from space. It ....
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http://en.wikipedia.org/wiki/OPALS
[Ogren Plant Allergy Scale] OPALS is an acronymn for Ogren Plant Allergy Scale. It is an allergy rating system for plants that measures the potential of a plant to cause allergic reactions in humans. == Scale System == The OPALS allergy scale was first published in `Allergy-Free Gardening`, by Thomas Leo Ogren, in 2000. It covers over 3,000...
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http://en.wikipedia.org/wiki/OPALS_(Ogren_Plant_Allergy_Scale)
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