Of course evolution is somewhat random, and you know, about 55 million years ago there was this rebellious little puffer fish faction that said, oh, the heck with the coral reefs -- we're going to head to the high seas.
When methane built up, or carbon dioxide built up, or oxygen was diminished, the birds would swoon before people would -- so it acted as an early warning system: Hey, get out of the mine. Things aren't going so well.
I wish I could say I was kidding about this, but if you go out and you buy the first few episodes of "Sesame Street" on DVD, as I did out of nostalgia, you will find a warning at the beginning saying that the content is not suitable for children.
it's similar to being a vocalist, except instead of it coming out of your throat, you're controlling it just in the air and you don't really have a point of reference; you're always relying on your ears and adjusting constantly.
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