WASHINGTON (AP) — The family of a retired FBI agent presumed dead after vanishing in Iran 18 years ago is calling for any deal between the United States and Iran to include the return of his remains.

A combination of 3D micro X-ray fluorescence spectroscopy (3D micro-XRF) and micro-XRF was utilized for the investigation of a small collection of highly heterogeneous, partly degraded Dead Sea Scroll ...