I like this craft for Sparks and Brownies. It would be fun to do along with a “Visit to the Doctors” sort of meeting, or a STEM meeting to explore sound.

Find out how to make a simple stethoscope that your kids can use to listen to heartbeats and learn how to calculate the resting heart rate.
— Read on www.mombrite.com/diy-stethoscope-for-kids/