What gives a dollar bill its value? – Doug Levinson

If you tried to pay for something with a piece of paper, you might run into some trouble. Unless, of course, the piece of paper was a hundred dollar bill….

Salt Matters: Preserving Choice, Protecting Health (Extended Version)

We can't see most of the salt we eat. We didn't ask for it and we don't even know it's there. It's hidden in the processed, packaged food we buy…