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
What’s in ice cream?
Ice cream can be made in a bucket of ice, … read more
In the Know
Splashes
Divers jump high. They try not to make big splashes. … read more
In the Know
Nature’s Light Show
They all flash again. These fireflies are called synchronous fireflies. They … read more