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Despite decades of research, the roles of climate and humans in driving the dramatic extinctions of large-bodied mammals during the Late Quaternary period remain contentious. Here we use ancient DNA, species distribution models and the human fossil record to elucidate how climate and humans shaped the demographic history of woolly rhinoceros, woolly(More)
The rich fossil record of horses has made them a classic example of evolutionary processes. However, while the overall picture of equid evolution is well known, the details are surprisingly poorly understood, especially for the later Pliocene and Pleistocene, c. 3 million to 0.01 million years (Ma) ago, and nowhere more so than in the Americas. There is no(More)
Current biogeographic models hypothesize that brown bears migrated from Asia to the New World ~100 to 50 thousand years ago but did not reach areas south of Beringia until ~13 to 12 thousand years ago, after the opening of a mid-continental ice-free corridor. We report a 26-thousand-year-old brown bear fossil from central Alberta, well south of Beringia.(More)
  • Christopher Alberts, Robert J Ellison, Carol Woody, References Ellison, R Goodenough, J Weinstock +4 others
  • 2010
Project Description Cyber assurance is the justified confidence that networked systems are adequately secure to meet operational needs, even in the presence of attacks, failures, accidents, and unexpected events. This requires appropriate consideration of operational security across all aspects of acquisition, development and deployment, and operations and(More)
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