What it is:  The American Heart Association has a new set of heart interactives on their site, Be the Beat.  On Be the Beat, students can explore the heart, view a healthy vs unhealthy heart and perform virtual CPR during a cardiac arrest.  The interactives have extremely life-like graphics and can be manipulated to view the heart under a variety of circumstances.  Students can speed up heart rate or adjust layers of the heart.  The CPR simulation is excellent.  It leads students through a scenario where a friend collapses.  It is up to students to decide how to administer CPR…