My first understanding of Cahokia and pre-Columbian cities of the Americas came from the book 1491. Between 1050 and 1200 A.D., Cahokia was North America's largest and most prominent cultural center north of Mexico. It wielded economic power and religious influence from the Great Lakes to the Gulf of Mexico. A new paper published in... Continue Reading →

A Weak Sun Possibly Brought Down The Tang Dynasty & Mayan Civilization

Tomorrow's issue of Science hosts lots of interesting papers, one of which is titled, "A Test of Climate, Sun, and Culture Relationships from an 1810-Year Chinese Cave Record," and reports on the analysis of a 1.2-meter-long stalagmite from Wanxiang Cave in northern China. The analysis tells us that the rock holds records of waning Asian... Continue Reading →

A Refined Ar/Ar Date For The ‘Devil’s Footprints’ From The Roccamonfina Volcano In Italy

I remember reading a short announcement in 2003 about the discovery of 385,000–325,000 years old human-like footprints near the Roccamonfina volcanoes in southern Italy. We haven't found many paleo-footprints, so any discovery is welcomed with excitement and of course with controversy. Some of the most notable paleo-footprints are the 3.5 million year old prints from... Continue Reading →

Again on Ancient African Megadroughts

PNAS finally published one of the two sets of ecological explanations for the Out-of-Africa theory in "East African megadroughts between 135 and 75 thousand years ago and bearing on early-modern human origins." The second publication "Ecological consequences of early Late Pleistocene megadroughts in tropical Africa" also came out earlier this week. If you didn't catch... Continue Reading →

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