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" ... In a synchrotron, electrons travelling at close to the speed of light do laps in a giant ring surrounded by powerful magnets. As the magnets force the electrons to curve with the ring, the electrons give off electromagnetic radiation in the form of X-rays. These incredibly bright X-rays can be focused into beams as narrow as one micron, and aimed at microscopic crystals of proteins. As the X-rays bounce off the atoms in the proteins, the resulting patterns of diffracted light can reveal exactly what those proteins look like at the atomic level. ... "
" ... “If you know the angles and relative intensities of these diffracted beams, then you can identify what material it is — it’s like a fingerprint,” Stock said. “As far as I know, no one has tried to non-invasively interrogate what’s inside an object like this.” ... "