Atoms and molecules move far too fast for the human eye and most of our instruments to see clearly, meaning much of what happens down at that scale is shrouded in mystery. To get a better look we need a "camera" that's several kilometers long, and one such facility is firing up this month. The European X-ray Free Electron Laser (XFEL), which happens to be the largest x-ray laser in the world, can take 3,000 images per second of that tiny world.
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