○○○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
○○○Madaba⪢⪢
In the late 19th century, construction began on a new Greek orthodox church in Jordan's capital city of Madaba.
#image #place
http://qindex.info/i.php?x=17336
○○○rural⪢⪢
Now hanging up in the Art Institute of Chicago, American Gothic is one the most famous paintings of 20th century rural Americana.
#art
http://qindex.info/i.php?x=23861
•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
○○○ Madaba ⪢⪢
• 0750± positional notation
◌◌◌ Iraq
