Aging is difficult in a culture that celebrates youth. Age spots, wrinkles and lines, hollows in your face where they didn't used to be -- those are all normal effects of getting older (and sun exposure), but it can be hard to look in the mirror at the face you've known all your life and see something different.
When it comes to wrinkles and lines, there's an injectable answer to making them go away: Botox. It's expensive, and the effects are temporary, but the women (and men) who swear by it say that they look less tired, less stressed and, most importantly, less old.
Since 2002, Botox has been administered in more than 11 million cosmetic procedures [source: Allergan]. But it's far from a simple substance. What is this stuff we're injecting into our faces?