Think about the human forehead-the part
of the face above the eyebrows. Do you think
it is soft, like a pillow, or hard, like a desk? The
forehead is hard because the skull, or cranium,
is right there under the skin. The cranium is one
set of bones in the body. It protects the brain, a
I very soft organ.
organ. The cranium
very important and
is like a crash helmet, except that it is not as
strong. For that reason, people need to wear
helmets when they play some sports.
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