http://opinionator.blogs.nytimes.com/2011/12/25/the-future-of-moral-machines/
Building an AI does not require it being a computer - it could be a bunch of rubber bands if that's what worked
You can build a computer out of pretty much anything, including rubber bands.
http://opinionator.blogs.nytimes.com/2011/12/25/the-future-of-moral-machines/