NEW YORK (AP) — Chelsea Clinton is going to work for NBC News.The network said Monday that it has hired the 31-year-old Clinton to work on projects for the "NBC Nightly News" and Brian Williams' newsmagazine "Rock Center." She will do projects in the "Making a Difference" series, generally positive stories about individuals and companies.The only child of former President Bill Clinton and Secretary of State Hillary Rodham Clinton has been working primarily as a business consultant.NBC News already has another daughter of a former president, Jenna Bush Hager, doing work at the "Today" show.___NBC is owned by NBC Universal.