Obama gains 13 points among pro-choice independent women -- who make up 9 percent of the sample -- and 9 points among pro-choice Republican women, who account for 5 percent of the sample, according to the poll.

CNN: Will her gender sway women to Palin?

According to Bain analysis, more than 80 percent of the unrealized investments in a sample of buyout funds we examined were completed between 2005 and 2008.

FORBES: Exit Pressures Are Building In Private Equity

According to web analystics service StatCounter, at the end of 2012 7.92% of its sample of three million global net users accessed the internet via Safari, while 36.42% used Google's Chrome browser.

BBC: Apple users launch privacy campaign against Google

Taking a sample from one part of a tumour may not reveal its full genetic identity, according to research by scientists from Cancer Research UK (CRUK).

BBC: DNA analysis shows huge genetic diversity in tumours

According to ACB guidelines, Warne faces a mandatory two-year ban from the game if the B sample, which will be tested in the next few weeks, also proves positive.

BBC: Warne out after failed drugs test

Only when Centers for Disease Control and Prevention scientists sent a suspect sample to the mass spectrometer did they discover the new variety of swine flu, according to an article describing the techniques in Science magazine.

CNN: Commentary: Flu shouldn't close Mexico border

They track how unemployment has changed over time in the sample as a whole, and then they look at how its evolution differs across countries, according to how rigid their labour markets are.

ECONOMIST: A shocking error