A parabola is an open curve. If you come in on one side of a parabola, you make
the turn and go out the other side, and you're never heard from again.
An ellipse is a closed curve. You can keep going around and around an ellipse, and
every time you go around, you pass the point where you started. An ellipse looks
like a circle that somebody sat on, and partially squashed it.
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