Remember the Unabomber and that itty-bitty shack he holed himself up in? Well, they’re in the news again. In a handwritten letter dated July 15 to the 9th U.S. Circuit Court of Appeals in San Francisco, the Unabomber — a.k.a. Theodore Kaczynski — complained about a museum exhibit featuring the shack in question. The museum in Kaczynski’s letter is none other than D.C.’s own Newseum. The cabin, measuring 12 × 10 ft., is part of…