Happy 101st birthday, Opal! The Oak Ridge Calutron Girls played a pivotal role in the Manhattan Project during World War II. Happy 101st birthday, Opal!

One of the last few Oak Ridge calutron girls, Mona Beckner, will soon be celebrating a century of life. She turns 100 on January 18. The East Tennessee native has a life worthy of history books.

One of the last few Oak Ridge calutron girls, Mona Beckner, will soon be celebrating a century of life. She turns 100 on January 18. The East Tennessee native has a life worthy of history books ...