○○○ 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
• 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.
• 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