Scientific American - May 2009
PDF | English | 5.1 MB | 70 pages
Scientific American is a popular-science magazine, published (first weekly and later monthly) since August 28, 1845, making it the oldest continuously published magazine in the United States. It brings articles about new and innovative research to the amateur and lay audience.
Scientific American (informally abbreviated to "SciAm") had a monthly circulation of roughly 555,000 US and 90,000 international as of December 2005. It is a well-respected publication despite not being a peer-reviewed scientific journal, such as Nature; rather, it is a forum where scientific theories and discoveries are explained to a wider audience.