OK, OK. You can't smoke hemp — well, you can but you'll just get a headache. But you can build a house with it, make beautiful clothes with it, and improve your health too. It's a crazy-useful plant that's good for the environment. George Washington farmed it, but we don't grow it in the U.S. for really weird reasons. Find out the eye-crossing excuse for why it's banned to farmers — and all the great reasons why it shouldn't be.