century ⪢⪢
http://qindex.info/i.php?x=17844
 century ⪢⪢
http://qindex.info/i.php?x=17895
○○○ James Clerk Maxwell ⪢⪢
Figures like Newton and Huygens worked with light in the 17th century but a more sophisticated description of light which we call classical electromagnetism was developed largely by James Clerk Maxwell in the 19th century.  
http://qindex.info/i.php?x=7097
 0850 ± ⪢⪢
During the 9th century, Scandinavia in northern Europe is populated by, among others, the Vikings, excellent sailors who explore in all directions to plunder but also to develope trade routes.
http://qindex.info/i.php?x=5285
 Thomas Piketty's Capital in the 21st Century
http://qindex.info/i.php?x=4776
 0750± positional notation
By the 8th century, Indian mathematicians had perfected positional notation and over the next several centuries, Arab merchants, scholars and conquerors began to spread it into Europe. -- vigesimal, Maghreb, Hebrew, glyph, Aztecs, duodecimal, sexigesimal
http://qindex.info/i.php?x=4984
◌◌◌ Iraq
A Brief History of U.S. Intervention in Iraq Over the Past Half Century
http://qindex.info/i.php?x=1704
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