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Science News for October 26, 2007


The coevolution of parochial altruism and war

SFI researchers Samuel Bowles and Jung-Kyoo Choi suggest that altruistic behavior towards fellow group members may have evolved together with hostility towards outsiders. The study found that the combination of these traits enabled survival, as they promoted group conflict, which in turn contributed to their success.

SourceSanta Fe Institute·JournalScience·DateOct 26, 2007

Red hair and freckles...

Scientists discovered that at least one percent of Neanderthals in Europe had red hair, a finding based on genetic analysis. This rare trait was linked to the mc1r gene mutation, causing lighter skin and more freckles.

SourceMax-Planck-Gesellschaft·JournalScience·DateOct 26, 2007

Emergence of recombinant forms of HIV: dynamics and scaling

A new model of HIV dynamics accurately predicts the emergence and growth of recombinant forms of the virus in infected individuals. This framework also establishes scaling relationships between the prevalence of these resistant strains and overall infection extent.

SourcePLOS·JournalPLOS Computational Biology·DateOct 26, 2007

The largest colonic lipoma to date

A case of a giant submucosal lipoma located in the descending colon is presented, highlighting key findings such as abdominal pain, bleeding per rectum, and change in bowel habits. The study suggests that colonic malignancy should not be ruled out in patients with significant symptoms.

SourceWorld Journal of Gastroenterology·JournalWorld Journal of Gastroenterology·DateOct 26, 2007