Have you ever had a swim day where the water just seemed to work against you? Did you put it off to some issue with your own physical ability for that day? Or something in your mind? I just read an absolutely fascinating article in New Scientist about how water can actually work against your stroke. Scientists were wondering why apparently strong swimmers were reporting trouble with the water - some even drowned.
Investigators discovered that different temperature gradients in water (i.e. warm on top, cooler down below) can create a wave between them which can work against the swim stroke propulsion by as much as 40 percent!
I'm filing a patent today for a big pool-water blender to keep the water temperature consistent throughout (kidding!).
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