In the following lesson students are asked to devise a plan to measure the distance of a balloon's flight, predict the direction a balloon will travel as it deflates, learn about Newton's Laws of Motion, experience Newton's Third Law,...

This site has a comprehensive overview of the September 11, 2001 attacks on the U.S., including information on Osama bin Laden's background, the formation of Al Qaeda, the attacks themselves, the US response, civil liberties and national...