10 The human heart does a lot of work, but a man’s heart weighs about as much as two baseballs. ©2016 American Heart Association. Text and design by The Education Center, LLC 10 Gather two baseballs. Pass them around the room to help students understand how much the heart can weigh. Then have students speculate how something so relatively small can do so much work. ©2016 American Heart Association. Text and design by The Education Center, LLC
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