W?h?a?t? a?r?e? a?r?g?o?n? a?n?d? m?e?t?h?a?n?e? g?a?s? a?n?d? i?t?s? u?s?e?f?u?l? a?n?d? h?a?r?m?f?u?l? e?f?f?e?c?t?s?