No. Both foci are always inside the ellipse, otherwise you don't have an ellipse.
Ellipses are a scientific word for the shape of an oval. for example the planets orbits are ellipses.
A geometrical curve is defined as any set of points. Therefore, counter-intuitively, a straight line is also a geometrical curve.
Yes, the curve ball curves. This is because of the way the ball is thrown, which is a kind of a spin/jerky fast motion.