Five-year-olds know everything

Yesterday was a lovely day so we met up with Grandpa and played at the park. While at the park I told Sophia, flying high on the swing, "I am going to push the swing so high and let's see if you can fly off the earth", playfully of course.

She replied, "Mommy, there is no way you could do that! I am too heavy."

I inquired, "Oh, why do you say that?"

Her answer was, "Well gravity holds us on the earth.  I learned that from 'The Cat in the Hat' TV show."