Can you use flour instead of cornstarch to make oobleck?

No, you cannot use flour instead of cornstarch to make oobleck, as they have different properties. Oobleck requires cornstarch and water to achieve its unique non-Newtonian fluid characteristics, where it behaves like a solid under pressure and flows like a liquid when at rest. Flour does not create the same starch gel structure needed for this behavior, so the result would not be the same.