Hi- I got this question from Harvard Econ. Prof. Greg Mankiw's blog. He got it from Richard Rorty. Here it is:
"Aliens from another planet, with vastly superior intelligence to humans, land on earth in order to consume humans as food. What argument could you make to convince the aliens not to eat us that would not also apply to our consumption of beef?"
What's the answer!?!?! Thanks!