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
In the Know
Growing Duckling
The duckling’s fuzzy feathers will change as it grows. The … read more
In the Know
What is Glassblowing?
Glassblowers use the metal tube like a straw. It is … read more
In the Know
Winter Birds
Winter birds have special behaviors to survive the cold. They … read more