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http://www.k12.wa.us/assessment/WASL/SocialStudies/default.aspx
http://www.isbe.net/ils/social_science/capd.htm
http://www.google.es/search?hl=es&q=social+science+classroom&btnG=Buscar+con+Google&meta=

Aniversario del nacimiento de Alexander Graham Bell

Alexander Graham Bell (Edimburgo, Escocia, 3 de marzo de 1847 - Beinn Bhreagh, Canadá, 2 de agosto de 1922)




Alexander Graham Bell (3 March 1847 - 2 August 1922) was an eminent scientist, inventor and innovator.

• 10 March 1876—The first successful telephone transmission of clear speech when Bell spoke into his device, “Mr. Watson, come here, I want to see you.” and Watson heard each word distinctly.

• 30 January 1877—Bell's U.S. patent 186,787 is granted for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell.
• FUENTE WIKIPEDIA.