The title and release date of Donald Rumsfeld's memoir are now known, or, as he might say, are now known knowns. The book is called “Known and Unknown,” and it's coming in January. Rumsfeld, 78, will write about his childhood and long political career, starting as a Republican congressman from Illinois in the 1960s and then as secretary of defense under President Gerald Ford and President George W. Bush, the publisher, Sentinel, said in a statement Monday. Rumsfeld, a leading advocate of the war in Iraq, became increasingly controversial during his years in the Bush administration and resigned soon after the 2006 midterm elections, when Republicans lost control of Congress. “Known and Unknown” refers to a widely quoted explanation — praised by some as philosophy, criticized by others as double-talk — Rumsfeld offered in 2002 about the lack of evidence that Iraq was supplying terrorists with weapons of mass destruction.