Tomorrow we finish Schwitzgebel's "1% skepticism."

Thought question for tomorrow:

Watch this short but excellent explanation of Boltzmann brains. 

1. How is the argument for Boltzmann brains a skeptical argument?

2. How is it similar to the simulation hypothesis, but dissimilar to  the BIV and Cartesian Demon skeptical hypotheses? 

3. The Boltzmann Brain hypothesis implies that random fluctuations of the universe that produce conscious brains are far more likely than random fluctuations that produce the singularity required for the Big Bang. This suggests that if we are to accept the Big Bang hypothesis, we are required to believe that it was not a random fluctuation of the universe that produced this singularity. Discuss any implication of this you find interesting.