To test whether aging reduces the ability of pedestrians to multitask, Neider and his colleagues created a simulated crosswalk using a self-powered treadmill, video screens depicting a busy street, and special goggles that create the illusion of virtual reality.
In the attached article, entitled "Nukes: Test Them or Lose Them, " Secretary Schlesinger makes clear that the United States is taking potentially grave risks if it is unable realistically to test the effects of aging on a stockpile that is approaching the end of its designed shelf-life.