... and its causes. Posted something previously about a study conducted using rats about addiction which this video includes but also includes evidence to support the findings in humans too. A really good vid I think.

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This is the version of ratpark previously posted

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and this is its Wikipedia entry.

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Man is the most insane species. He worships an invisible God and destroys a visible Nature. Unaware that this Nature he’s destroying is this God he’s worshipping.

Hubert Reeves