It's common to look back at the past and identify ideas that were widely held 100 or 200 years ago that seem shocking or barbaric today. When this happens, we pat ourselves on the back for being so much more enlightened than our ancestors. But it seems unlikely that we've somehow reached the end of this process: I would guess that in 100 years, folks will look back at us just like we look back at people 100 years ago.

  So here's the question: What are the ideas or practices that are uncontroversial and widely accepted today — and that you personally find unobjectionable — that you think might be seen as barbaric or immoral one hundred years from now? To clarify, ideas or practices that you personally find barbaric or immoral today aren't eligible. You can't just predict that some day the world will realize you were right, and that your minority opinion will become majority opinion. Rather, the idea is to try to identify things that you actually don't find all that objectionable that you can imagine being seen as immoral or otherwise outrageous a century from now.