Our Mystery Science last week was all about the heart and what an incredible muscle it is!  We spent sometime listening and counting heartbeats on ourselves and on a partner.  We also counted resting heartbeats together and found our that we have a resting heart rate of about 45 beats per 30 seconds!  We logged our counting, used our fist to determine the size of our heart and made a special valentine!  What a “heartwarming” experience!