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A Change of Heart 

by Robert Núñez

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Come explore the lively and courageous story of A Change of Heart, where Arty the kangaroo journeys through life with his big heart. Filled with vibrant spring colors, each page sparks a world of positivity. Get ready for plenty of hops—and a truly fulfilling ending.


Hypertrophic Cardiomyopathy (HCM) 


This book is dedicated to those who have inherited the disease hypertrophic cardiomyopathy. The disease can cause heart muscles to thicken, obstructing blood flow.  According to the CDC, this disease affects 1 in 500 individuals. In this story, I tried to convey the disease's thickened heart muscles with Arty's oversized heart. 



Thank you so much for your support! 



*A percentage of proceeds will be donated to hospitals supporting heart disease 

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© 2026 Robert Nuñez

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