Scientific American Magazine.April 2007
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. ^[1] 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. In the past scientists interested in fields outside their own areas of expertise made up the magazine's target audience. Now, however, the publication is aimed at educated general readers who are interested in scientific issues. The magazine American Scientist covers similar ground but at a level more suitable for the professional science audience, similar to the older style of Scientific American.