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http://www.scientificamerican.com/article.cfm?id=gamow-gravity There's nothing like a nasty cold to make you appreciate good health. The same goes for the state of the universe: Tweaking just one of the fundamental physical laws or constants, normally perfectly "fine-tuned" at the right values to allow stars, planets, atoms and life as we know it to flourish, could turn things very different -- quite unpleasantly so. Imagining such a "bizarro" universe may heighten your appreciation for the norm.

Group urges governments to crack down on legal drugs made my tweaking chemical structure of well-known illegal narcotics