I was talking to my Mom a little bit ago about some uncomfortable truths. She said it couldn't be true because she had never heard it before. I reminded her, if she wouldn't consider anything she'd never heard before, she would never learn anything ever again. I don't know that it truly changed her outlook on life, but it definitely got her attention at the moment.
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walking is unheard of to a group full of babies and reading and writing is unheard of to some present day remote tribes...