Curated OER
Sound Waves
Students explore sound. In this "sound" science lesson, students define sound and explain how sound travels. Students experiment with paper cups and string to conclude how sound travels. Students research a chosen aspect of sound with a...
PBS
Who Made America? Alexander Graham Bell
From a PBS series, They Made America, comes this biography of Alexander Graham Bell and his invention of the telephone. Read about his development of the telephone and research into the sound.