Far & Near / Runaway Trolleys / The Proximity Of (Fat) Strangers
I went to the Royal Institute last week to hear the laconic and dismissive Dr Guy Kahane on whether we are 'Biologically Moral' [His message: Neurological evidence suggests - somewhat alarmingly - that our moral and ethical decisions may be no more than post-hoc rationalisations of purely emotional, instinctive reactions....

relevant article in the New Yorker http://www.newyorker.com/reporting/2007/08/20/070820fa_fact_page?currentPage=all