A helicopter flies low over the Appalachian Mountains, moving slowly above mostly forested lands of Maryland, Pennsylvania, and West Virginia. The aircraft carries a blue-and-white box holding instrumentation to detect unseen photon gamma…
A helicopter flies low over the Appalachian Mountains, moving slowly above mostly forested lands of Maryland, Pennsylvania, and West Virginia. The aircraft carries a blue-and-white box holding instrumentation to detect unseen photon gamma…