○○○ elaborate ⪢⪢
When stars with masses a bit bigger than our own sun reach the end of their life and begin to collapse to form light hot dwarf stars, they will throw off their outer layers of matter. This matter will
spread and form an elaborate cloud of gas which ...
http://qindex.info/i.php?x=19940
• 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
