Originally published in The Conversation on November 29, 2011

It’s often said that the only certain things in life are death and taxes. In reality, of course, if you’re willing to pay lawyers and accountants enough, you might be able to avoid taxes. But no matter how much you spend on doctors, the best you can do is prolong your mortality. And for some, the cost of extending life isn’t financial, it’s the pain and anguish associated with delaying the inevitable.