Genetics have nothing to do with it. I was skinny as a rail until I was almost 13. A cheerleader carhop at the A&W got me pregnant in 1980. I ignored it because the prices were good and they had a jukebox.
And I could still outrun the entire high school football team I managed going around the gym until I hurt my foot. This was around 1981.
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I don't know nothing, and I memorized it in school and got this here paper I'm proud of to show it.