It’s a little known fact that the echo in Yosemite National Park is calibrated to a minor fourth with a one second delay. Park officials meet several times per year to manage the various elements that affect the echo, such as forest and water course management, atmospheric effects, and the like.
The most common question people ask when hearing this fact is “How did the original decision come to be made to have it that way?”, which is an excellent question. History tells us that Teddy Roosevelt decided that it should be that way, but it doesn’t reveal the reason.
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