getting parkinson's disease, so that is a clear difference in a large study. now, wolf, i want to make it clear that these researchers said over and over again, please make sure that you don't tell people to smoke, because we don't want people to smoke, because it is terrible for the body, increases your chance for heart disease and cancer and all sorts of diseases, so don't smoke, but what they are hoping is that from these studies they can figure out what is it about cigarettes that help lower the risk of parkinson's? some specific chemical in the cigarettes and maybe they can make a drug out of the chemical where you get the advantages of the cigarettes without the disadvantages. >> elizabeth cohen with the latest study. thank you. fascinating and potentially significant. the president took aim and now the chief justice of the united states is firing back. john roberts is suggesting that he may not even show up at next year's state of the union address before a joint session of congress. forbes billionaire's list is