a nonlinear effect that seemingly turns materials transparent is seen for the first time in x rays at slacs lcls /

Imagine getting a medical X-ray that comes out empty – as if your bones had vanished. That's what happened when scientists cranked up the intensity of the world's first X-ray laser,at the Department of Energy's SLAC National Accelerator Laboratory, to procure a better look at a sample they were studying: The X-rays seemed to fade right through it as if it were not there.

Source: phys.org