Galena is lead(II) sulfide, the most important lead ore. Crystallizes in cubic system with octahedral forms. Contains up to 0.5% silver in some deposits. Forms close-packed cubic unit cell with lead and sulfur
Based on German Patrone 88 cartridge adopted in 1888. Redesigned in 1903 with lighter bullet and improved performance. German military adopted it in 1903-1905 as standard service cartridge
Lead and copper have been used in architecture for thousands of years. Copper roofs were installed on Sri Lanka's Lovamahapaya Temple in 3rd century BCE. Iron became cheaper than lead in early 19th century. Henry Palmer patented corrugated metallic sheets in 1829
Tula is located 120 miles south of Moscow on the Upa River. The Tula Kremlin, built in 16th century, features two cathedrals. Yosnaya Polyana is Tolstoy's former home, now a museum. The Museum of Samovars showcases the history of metal vessels
Andorra coins feature European flag stars and "virtus unita fortior" motto. Austria coins show Bertha von Suttner portrait and "2 EURO ***" design. Belgium coins feature King Albert II in three series. Croatia coins show map on chequerboard background with "O LIJEPA O DRAGA". Cyprus coins depict Chalcolithic idol from 3000 BC
William the Conqueror built the castle around 1077, first in England with a free-standing tower keep. The White Tower was whitewashed in 1240 using white lime. The castle was surrounded by a curtain wall with corner towers and Roman walls