"If you think about something for long enough,' she explained, `more than likely, that thing will happen.' She tapped her head. `It's all in the mind.

They believed that if a mouse found your hair clippings and built a nest with them you got a headache. If the nest was big enough, you might go mad.
They believed that if a mouse found your hair clippings and built a nest with them you got a headach...
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