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Principle of Least Action - At some point in your physics career, you may ask why projectiles move in parabolas. Why that shape, of all of the possible shapes that the projectile could possibly move? Well, the answer lies in a physics principle called Least Action. It turns out that objects "try to minimize action." And that statement leads to the projectile trajectory we know, as well as countless other motions and behaviors in the universe. This principle accounts for many phenomena. Read the article and try the exercises. After that, explore the internet a bit more and seek out information on action; you might find this topic to be as interesting as Feynman did.
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