Lt. Col. Kris Roberts served as a facilities maintenance officer at Marine Corps Air Station Futenma in Okinawa, Japan in the 1980s. Courtesy of Lt. Col. Kris Roberts hide caption

itoggle caption Courtesy of Lt. Col. Kris Roberts

A U.S. Air Force C-123 sprays herbicides on dense jungle beside a South Vietnamese highway on May 18, 1966. This aircraft is the last in a formation of three. Spray from the other two planes can be seen ahead. U.S. Air Force via AP hide caption

itoggle caption U.S. Air Force via AP

Lynn Good has had many mentors throughout her career — but few of them were women. "So I'm generationally on the early part of the ascent of women into leadership roles," the Duke Energy president and CEO says. Pat Sullivan/AP hide caption

itoggle caption Pat Sullivan/AP

Scientists say that the best way to reduce a person's contact with the flame retardant chemicals in sofas and other furniture is to vacuum more. SINAN DONMEZ/iStockphoto.com hide caption

itoggle caption SINAN DONMEZ/iStockphoto.com