PHYSICS

She is seven, going on some much larger number.
She believes in the tooth fairy.
She believes in the scientific method.
She believes in vegetarianism and ecology.
She believes in helping her parents
and was doing so when she found
her baby teeth in a small bag in their dresser.
She no longer believes in the tooth fairy
but she does believe in economics. And physics.
She told her parents that she expected
five dollars for each tooth going forward,
or her brother would learn something
that no four-year-old ought to know.
She believes that leverage is a key
principle of physics that every child should master.