There's been a lot of buzz on the Net* about the Nature commentary on cognitive enhancement I blogged about yesterday, in which I noted that you need only think about coffee to realize what a slippery slope the cog enhancement issue presents.
If you want to experience first-hand just how slippery, take this survey, which reader Michael Lanthier kindly drew my attention to. It starts with a question about coffee and pulls you inexorably, um, downhill from there.
It's hard to take that survey without concluding the issue of enhancement offers no bright lines. if someone knows of a rigorous argument to the contrary, please chime in.