| |
| | 4TH MILLENNIUM BC FACTS AND INFORMATION (Site not responding. Last check: 2007-10-22) |
 | | Sumerian city of Ur in Mesopotamia (40th_century_BC); Sumerian hegemony in Mesopotamia, with the invention of writing, base-60 mathematics, astronomy and astrology, civil law, complex hydrology, the sailboat, the wheel, and the potter's_wheel, 4000–2000 BCE. |
 | | 3000 BC – Menes unifies Upper and Lower_Egypt, and a new capital is erected at Memphis. |
 | | Based on studies by glaciologist Lonnie Thompson (professor at Ohio State University and researcher with the Byrd Polar Research Center) http://www.news-about-space.org/story/2409.html a number of indicators shows there were a global change in climate 5,200 years ago: |
| www.gottaorderflowers.com /4th_millennium_BC (465 words) |
|