The Las Conchas wildfire in New Mexico spread dangerously close to the Los Alamos National Laboratory this week, causing the evacuation of the town and the shutdown of the lab, which is the headquarters for US military research. The laboratory was created during World War II to develop the first atomic bomb for the Manhattan Project and houses highly sensitive materials. As a precaution, scientists are monitoring radioactivity in the air. (Editor's Note: We will not post on Monday, July 4th, we'll see you again on Wednesday, July 6, 2011.) -Leanne Burden Seidel (34 photos total)