The Washington Post, August 30th, 1991
Why are there two high tides a day, rather than one? Being a not-totally-dense person, you know the tides are caused by the moon. You cling like a drowning person to this thin fiber of knowledge. Regrettably, if you visualize the situation, you might easily get confused. Picture Earth and the moon, facing off against one another across a void of a quarter of a million miles. The moon is pulling on Earth, right? The ocean is bulging up a little, right? And Earth is spinning, right? So now ask yourself why a given piece of ocean shouldn't bulge up only once every 24 hours, rather than twice. Scr...
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