The American public has long been on the lookout for unsteadiness in the leader of the free world. It's important to us (or, historically, has been) that the president seems, well, well. If not robust. Of course, the president is a human, and as such is not immune to malady. 

So why do we care so much about the president's health? Are they under obligation, legal or otherwise, to keep us in the loop? What happens when they don't?

Our guide today is clinical ethicist Joel Wu.

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