Americans tend to think of our Constitution as a hallowed source of wisdom that should be tampered with only in the most extreme circumstances. But what if it’s really just old—and dumb?

Peter Singer is a professor of bioethics at Princeton University and one of the world's most prominent—and controversial—moral philosophers. He's written influential works on poverty, charity, and euthanasia, and is considered a founder of the modern animal rights movement. He's here to speak to you.

This is really a product that was begging to be made. Your baby is dirty. It crawls around, babylike, tracking dirt all over the floor. Why not turn that smelly, crawling, crying mess into a mop? Mother's little helper, indeed.