Oak Ridge National Laboratory

Among the most cherished artifacts of Oak Ridge National Laboratory is a small unassuming logbook with pages yellowed by time. The book was used by a group of researchers doing classified work in 1943 to record experiments at the X-10 Pile, a facility that later became known throughout the American scientific community as the Graphite Reactor. The book's most famous entry is dated November 4, 1943, with scrawled handwriting that reveals the author's excitement.

http://www.bwxt.com/operations/ornl.html