Scientific American facts for kids
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 non-scientific audience.
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SCIENTIFIC AMERICAN SUPPLEMENT No. 1100 January 30, 1897 featuring Canet naval guns for the Greek ironclads
Scientific American Facts for Kids. Kiddle Encyclopedia.