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What’s a Fact?
Sometimes it’s hard to tell what’s a fact, what’s a wild guess, and what qualifies as a valid scientific theory. Folks often use the word “fact” to mean something that they really believe in — not necessarily something that can…
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Force That Takes No Energy
There are forces that we see every day that take no energy. How can you have a force that takes no energy? It all began with me musing as to how a magnet sticks to my refrigerator. A conversation with…
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Which Way Down?
OK. This is going to sound crazy, but the direction of down where you are is not the same as the direction of down where I am. Why? Because everything on Earth gets pulled towards the center of the Earth.…
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Dropping Hammers, Feathers, and Balls – Oh My!
How does gravity actually act? Back in ancient Greece, Aristotle said that the speed of a falling object depends on how heavy it is. Twice as heavy? It’s going to fall twice as fast. Well, that’s just common sense. A…