It's a sad day for numbers. Jerry Nelson, the puppeteer known for playing the instructional Count von Count on Sesame Street, died Thursday of unspecified causes, according to CBC Radio-Canada. He was 78. Besides the non-threatening vampire, Nelson, a Tulsa native who grew up in Washington, D.C., also performed Gobo Fraggle on Fraggle Rock and The Muppet Show's Sgt. Floyd Pepper of the Electric Mayhem band; "Pigs in Space" stalwart Dr. Julius Strangepork; Kermit the Frog's nephew Robin; and Gonzo's girlfriend Camilla the Chicken, among other roles, says the site. He first trained with American puppeteer Bil Baird,...