How seriously are Boltzmann Brains taken by the scientific community? I understand there is at least some mathematical evidence for their (someday?) existence, but do many physicists think that there is anything worthwhile in examining the issue? Or, is it one of those "how many angels on the head of a pin" questions? And, if it's not too sci-fi-ey for me to ask, are there any reasonable ideas about what the "anatomy" of a Boltzmann Brain might be? Thanks. I checked out wikipedia already, but I have no idea what is really true on that site.