Steven Pinker homes in on my own recent obsession:
I've had to question the overall assumption that human evolution pretty much stopped by the time of the agricultural revolution.
If it pans out, it's a paradigm-changer of profound proportions.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2008/01/what-did-you-change-your-mind-about-in-2007/222005/
