What about the size of your heart? A child’s heart is about the size of a fist.
What Can You Do? Why do you think animals have hearts of different sizes?
Photo Credit: decade3d – anatomy online/Shutterstock
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Inspired by Nature
Japan has a train called the “bullet train.” It is … read more
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Penguins and Where They Live
Penguins are part of a system. The area where penguins … read more
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Ellis Island
Ellis Island opened on January 1, 1892. What is Ellis … read more