Acting Editor in Chief Mariette DiChristina explains the September 2009 issue of Scientific American
A study in the journal Science suggests that early humans were fire-treating stone more than 70,000 years ago to make better stone tools. Cynthia Graber reports
Archaeologists in South Africa have uncovered the earliest evidence of humans using pyrotechnology to shape their stone tools
Scientists are looking to strange sea life for records of climate's past--and forecasts of future warming
An improvement in microscopic dye analysis is allowing scholars to study the origins and histories of ancient, colorful art
Overhunting by Clovis people over centuries, not a catastrophic impact, may have wiped out North American mammoths and other megafauna, researchers say
Yucca Mountain was supposed to be the answer to the U.S.'s nuclear waste problem, but after 22 years and $9 billion, that vision is dead. Now, some say that doing nothing in the near term may be the smartest solution...
A forensic analysis suggests that the weapon wielded in a stabbing attack came from modern humans
A new model for comet production revises the theory of their origins
A researcher says a chemical compound on the Vinland Map may not have come from a modern pigment after all
Skepticism about a fossil cast as a missing link in human ancestry
Versatile, easy-to-replace "microliths" found in south Asia could have helped early humans better tame their environments
Tiny hexagonal diamonds suggest a massive impact during the late Pleistocene that could have wiped out the Clovis people, mastodons and other continental inhabitants--but the geologic evidence falls short for some skeptics...
Acting Editor in Chief Mariette DiChristina introduces the August 2009 issue of Scientific American
Scientists are checking advanced climate simulation models against existing data to find that they're running right on track to better predict drastic climate change
Innovation and discovery as chronicled in past issues of Scientific American
In this series of episodes, we talk to many of the scientists at Blue Sky Studios, which created the Ice Age series of animated features, including the recently released Ice Age: Dawn of the Dinosaurs ...
Political unrest between occupying Chinese and local Vietnamese groups--not climate change or agriculture--led to a surge in the frequency of fires