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    The effects of radon had been felt by Erzgebirge miners since at least the sixteenth century, as noted by Agricola in his seminal 1556 work DeRe Metallica (Agricola

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  • Behold the Tiniest Star Ever Discovered

    The small star (artists depiction shown in reddish orange) is about the size of Jupiter, and slightly smaller than the ultracool dwarf Trappist-1 (shown in grey

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  • Microblog: GOLD AND SILVER AND HARD

    Pretium Resources $PVG announced on July 3 that commercial production has been achieved at Brucejack. That achievement makes a nice breakpoint for a new thread

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    Chapter 10Respiratory System STRUCTURE AND FUNCTION. Morton Lippmann. The respiratory system extends from the breathing zone just outside of the nose and mouth

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  • Bentonite, Kaolin and Selected Clay Minerals

    First draft prepared by Dr Zoltán Adamis, József Fodor National Center for Public Health, National Institute of Chemical Safety, Budapest, Hungary; and Dr Richard B

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  • FBI Arrest Chinese National Linked to OPM

    A 36-year-old Chinese national was arrested in Los Angeles this week in connection with a computer hacking conspiracy involving malware linked to the 2014 US Office

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    Introduction. Recent scientific studies have contributed to a more complete understanding of the health risk from chrysotile asbestos as used today in high

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    AP World HistoryStearns Chapter 1 From Human Prehistory to the Early Civilizations . Introduction Human origin 2.5 million years ago 1/4000 of earths

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    Major technological developments. The commencement of the Industrial Revolution is closely linked to a small number of innovations, beginning in the second half of

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    Gunpowder is the first physical explosive and propellant. Before its invention, many incendiary and burning devices had been used, including Greek fire.

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  • IndustriesBusiness History of Industries

    FoodPart 2 . 610 A.D.Pretzels originated in Southern France or Northern Italy; young monk prepared unleavened bread for Lent (Christian period of

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  • GunpowderWikipedia

    Several sources mention Chinese firearms and gunpowder weapons being deployed by the Mongols against European forces at the Battle of Mohi in 1241.

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    Ghanas Gold Sparks Conflict With Illegal Chinese Miners Oct 08, 2012 · A boy sits beside the pit of an illegal gold mine which is near Ghanas biggest

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    When looking at these single, stand-alone rock piles along our mining properties, it is important to understand what they are. Most of them were not formed off the

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