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The nature of science  
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This news story describes the search for Pluto which began in the early 1900s and the subsequent discovery of its moon system. The text describes how the Hubble Space Telescope was used to discover Pluto's other moons. Star Witness News is a series... (View More)

Keywords: Reading
Audience: Elementary school, Middle school
Materials Cost: Free

This ChemMatters article provides a brief background on smog, then examines the causes of it, efforts to reduce it, and methods used to measure it. ChemMatters is an educational magazine for high school students.

Audience: High school
Materials Cost: Free