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New research challenges long-held assumptions of flightless bird evolution

Researchers have found that large flightless birds of the southern continents did not share a common flightless ancestor. Instead, each species lost its ability to fly after diverging from ancestors that had the ability to fly. This challenges the long-held assumption of vicariance and suggests parallel evolution among these bird species.

SourceUniversity of Florida·JournalProceedings of the National Academy of Sciences·DateSep 3, 2008

Low vitamin D levels associated with increased risk of death

Individuals with low vitamin D levels have a higher risk of death from all causes, according to a study analyzing data from the Third National Health and Nutritional Examination Survey. The analysis found that those with vitamin D deficiency had a 26% increased rate of death compared to those with adequate levels.

SourceJAMA Network·JournalArchives of Internal Medicine·DateAug 11, 2008

Refractive errors affect vision for half of American adults

A study found that refractive errors affect approximately half of U.S. adults aged 20 and older, resulting in significant vision impairment. The prevalence of refractive error increases with age, affecting individuals across all ethnicities, and is estimated to cost between $3.8 and $7.2 billion annually for glasses or contacts.

SourceJAMA Network·JournalArchives of Ophthalmology·DateAug 11, 2008

Actions of individuals key to saving biodiversity-and ourselves, Stanford biologists say

According to Paul Ehrlich and Robert Pringle, a multi-pronged approach involving individual and small group efforts is crucial for preserving biodiversity. By making modest actions such as reducing meat consumption or maintaining living hedges, people can collectively have a significant impact on the environment.

SourceStanford University·JournalProceedings of the National Academy of Sciences·DateAug 11, 2008

RNA emerges from DNA's shadow

Recent RNA research reveals new roles in regulating gene expression and structural components, with potential for creating compounds to overcome genetic disorders. The EUROCORES programme brings together European groups to collaborate on RNA quality control and its applications.

A baby's smile is a natural high

Researchers at Baylor College of Medicine discovered that mothers' brains respond uniquely to their own infants' faces, particularly when smiling. This finding could help scientists understand the neural basis of mother-infant attachment and how it sometimes goes wrong.

SourceBaylor College of Medicine·JournalPEDIATRICS·DateJul 7, 2008

Tethered molecules act as light-driven reversible nanoswitches

Researchers have developed a technique to attach light-sensitive organic molecules to metal surfaces, enabling reversible switching between two configurations in response to different wavelengths of light. This technology has potential applications in molecular motors, artificial muscles, and molecular electronics.

SourcePenn State·JournalNano Letters·DateJun 23, 2008

Terrorism risk determines homeland security spending

A new study published in Policy Studies Journal reveals that terrorism risk is a positive determinant of Homeland Security funding. The research analyzed DHS funding patterns from 2004 to 2006 and found no evidence of political influence on grant distribution.

SourceWiley·JournalPolicy Studies Journal·DateJun 5, 2008