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The number of scientific papers with authors from more than one country increased by 16 percent between 2012 and 2015, according to data from the Nature Index, which tracks national and institutional author affiliations across 68 natural science journals. The number of papers with co-authors from more than one country increased from 21,460 in 2012 to 24,951 in 2015, with the growth in international collaborations being especially strong in the life sciences.