re: Fun fact: No hurricane has ever crossed the equator

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The Coriolis force is real and ubiquitous, no doubt. However as I said the Coriolis effect is not a predictor in the rotation of water in a toilet. Nor a sink nor a bathtub. These scales are so small that the water would have to be perfectly still and the stopper perfectly released and the basin and drain perfectly shaped so as not to influence the rotation. And hold your breath. Even tornadoes do not always turn the expected way, because even at that scale the Coriolis force is very slight. Their rotation is influenced by the greater storm system that they are a part of.

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I agree.

This subject in terms of hurricanes (in the OP title) reminds me of the ocean engineering course I took a long time ago in college. I vaguely remember the mathematical model for low and high pressure systems. In the northern hemisphere high pressure systems are blunted by the Coriolis effect. In low pressure systems the model (equation) could go to infinity (because the model does not include other factors that blunt low pressure systems as the wind speed increases). In short, the Coriolis is additive to low pressure systems and subtractive to high pressure systems.