Nature Magazine May 5th 2011

Nature is the world's most highly cited interdisciplinary science journal, according to the 2009 Journal Citation Report Science Edition (Thomson, 2010). Its Impact Factor is 34.480. The impact factor of a journal is calculated by dividing the number of citations in a calendar year to the source items published in that journal during the previous two years. It is an independent measure calculated by Thomson Reuters, Philadelphia, USA.