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O. Hallatschek, P. Hersen, S. Ramanathan and D. R. Nelson, Genetic drift at expanding frontiers promotes gene segregation, Proceedings of the National Academy of Sciences 104, 19926 (2007).
This belief encouraged newcomers from the steppes to migrate toward the two expanding frontiers of Islām, where they could exercise their military skills, expect rich booty, and win new lands while enjoying the respect and admiration of fellow Muslims.
He imposed a tolerable stability at home even as he tightened Rome's hold in Europe and expanded frontiers in Africa and the Middle East (where he annexed Mesopotamia, today's Iraq).
Mr. Kareken, who wrote "Motherhood" in collaboration with Lee M. Silver, a Princeton molecular biologist, at first seems interested in the expanding frontiers of reproductive science, with its ability to turn nature's laws on their heads.
He spoke of previously unimagined dangers in the world, a phrase that seemed to encompass new implements and methods of warfare as well as the expanding frontiers of medicine.
Bedford continues her explorations into the emotional potential of the landscape by charging up ocean paintings that are historically more often connected with themes of war or expanding frontiers.
Social conditions are those of an expanding frontier.
What slowly deadened our aristocratic sense was the expanding frontier, but more the expanding machine. . . .
