From what I understand, the professor has since gone underground out of fear for his safety. Apparently nobody told him that freedom of speech doesn't include freedom from people who disagree with what you have to say. Although I don't condone threats to the guy, he's apparently having himself a Dixie Chicks experience.
Funny how liberals will do everything they can to shut down and silence conservatives, but when the same thing happens to them they scream censorship and oppression.
What does "gauge" mean anyway? As used here gauge means the number of round lead balls the same diameter as the inside of the barrel (aka the bore) that it would take to weigh one pound. It takes 12 lead balls the same diameter as a 12 gauge barrel to weigh a pound. The smaller 20 gauge would require 20 balls of that barrel diameter. The larger bore 12 gauge would require 12 lead balls of the bore diameter to weigh one pound.
In general the number of pellets in a shotgun shell...