"How a comma gave Americans the right to arms"
This article is making the rounds. It's rather fanciful. I don't see much difference in meaning between "A well regulated militia being necessary to a free state, the right of the people to keep and bear arms shall not be infringed," and "A well regulated militia, being necessary to a free state, the right of the people to keep and bear arms shall not be infringed."
The other problem is that both versions in fact exist. I have a letter from the Librarian of Congress on it. Records are sketchy, since many were lost when the British burned the Capitol during the War of 1812, but the version which was sent out to the States for ratification (at least the engrossed copy kept by the new government) had three commas, but when States sent back their ratifications, they recorded the Second Amendment with one, two, or three commas. There were no photocopy machines back then, and apparently scribes felt free to punctuate as they pleased when copying things.