[Free Registration/Login Required] This flipchart introduces fifth grade students to what sound waves do when they encounter an object. Topics covered include diffraction, reflection, absorption, and the Doppler Effect. An assessment is...

This site from Yahoo! Health discusses a heart attack. Learn what you can do to prevent having a heart attack and check out images showing the parts of the heart, the build up of plaque in arteries, and ECG waves after a heart attack.