NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Survival of the Sneakiest http://evolution.berkeley.edu/evolibrary/print/printable_template.php?article_id=sneakermales_01&context=0=0=0
Evolution Video Clips http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html