![reaction-microscope-x-rays-individual-molecules](https://utterbuzz.com/wp-content/uploads/2020/06/reaction-microscope-x-rays-individual-molecules.jpg)
For more than 200 years, we have been using X-rays to look inside matter, and progressing to ever smaller structures -from crystals to nanoparticles. Now, physicists have achieved a qualitative leap forward: using a new experimental technique, they have been able to ‘X-ray’ molecules such as oxygen and view their motion in the microcosm.