BOULDER, Colo., June 30 (UPI) — climate systems in the arctic may be more affected by global warming than previously thought and may be nearing a climate-change tipping point, a study says.

博尔德，科罗拉多，6月30日(合众国际社)- - -一项研究报告，北极气候系统受全球变暖影响可能比以前所认为的更大，也许正接近气候变化的临界点。

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Children with attention problems in early childhood were 40% less likely to graduate from high school, says a new study from Duke University.

杜克大学的一项新研究显示，童年早期有注意力问题的儿童，高中毕业的可能性要低40%。

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The study says there must be a complete overhaul of air traffic control systems.

研究称必须对航空交通管理系统进行彻底的改革。

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Now,a study says it can also spread.

VOA: special.2010.01.06

A new study says the leading cause of disability in older people in low and middle income countries is dementia.

VOA: special.2009.12.28

The study was partly supported by Vibram, which makes a kind of footwear that it says is like running barefoot.

VOA: special.2010.02.03

Future climate change could change the profile of tropical forests, with possible consequences for carbon storage and biodiversity, a study says.

BBC: Tropical forests 're-shaped' by climate changes

Two closely-related strains of Clostridium difficile became antibiotic resistant and were able to rapidly spread to hospitals around the world, a study says.

BBC: C. diff spread 'fast and easy'

Executives licensed to fly small aircraft led 176 of 2, 073 major public companies at some point between 1992 and 2009, a recent study says.

WSJ: Executive No-Fly Zone? When a CEO's Thrill-Seeking Rattles the Board