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What Goes Up Must Come Down
Here's some basic science: What goes up...must come down.
And everyone knows it. Airline pilots. Center fielders. Window washers. Stockbrokers. Pastry chefs. Parents of small children.
But why must it -- whatever it is -- come down? Figure that one out and you're well on your way toward figuring out this whole physics ball of wax. Here's the thing: Regardless of how much or how little of it you understand, physics is everywhere you look. In fact, you need physics just to explain the very act of looking.
Sure, it's easy enough to walk around thinking you've got a pretty good handle on the world around you. Why does a ball fall when dropped? Gravity. Why does a tree make a sound when it falls in the woods? Sound waves. Why does a light come on when we flip a switch? Electricity.
Unfortunately, knowing the answer to these questions isn't the same as knowing what gravity is, what a sound wave is, or what electricity is -- instead, using these one-word retorts just proves you were paying attention that day in class and memorized the answer in case anyone ever asked.
So just for fun, forget all that stuff you memorized in high school and imagine that the natural world is a complete mystery to you. As much a mystery as, say, the stock market is to most. If this was the case, wouldn't you start looking around and noticing a few things and trying to bring some order to the crazy, mixed-up world around you?