You have, as of today, a one hundred per cent chance of dying. But a lot of people would like a little more time to do things, like eat interestingly-shaped pastas, or play catch with their grandchildren. That makes sense. I'd also like to do those things. But sometimes, our pursuit to eat lots of pasta or die trying leads some of us to make decisions that don't actually help — like taking alternative, instead of conventional, cancer treatments.