Does He or Doesn't He? Stress and the Presidency, Part II

Recently I wrote about how the stress of being President (Stress and the Presidency) often causes President's hair to turn prematurely gray.  To illustrate my point I posted a picture of President Obama. Now, it appears that the President Obama is doing something about it (could it have been my post - yea, right). His hair appears to no longer be gray -- or, at least, less gray. Compare the following two pictures, the one on the left was taken the morning of January 19th; the one on the right was taken in the evening of the same day. Maybe the strategy is working. His approval rating has been increasingly lately...