Science and technology

Associated Press
FILE - This Friday, Oct. 18, 2013, file photo, shows a Twitter app on an iPhone screen, in New York. Twitter is tweaking its timeline. The social media site will let people turn on a setting that lets popular tweets related to people you follow show up first in your timeline. It's part of the microblogging service's attempt to make its service more accessible to new users. (AP Photo/Richard Drew, File)

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