Secrecy and invisibility were the Energy Department's legacy for half a century. But when Secretary Hazel O"Leary took charge, the doors began to open and the lights were turned on. Wherever they weren't absolutely needed, security doors -- including those in O'Leary's office -- came down. The Department is declassifying decades-old secrets on a routine basis. In one effort alone, it recently reviewed 1.7 million pages and declassified 93 percent. Another 11,000 documents concerning radiation experiments on humans have been found and will be made available to the public.