A New Microscope Can See Inside Moving Cells in Real Time (2014) [video]
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If you want to see more videos, the supplementary section of the article has quite a few with descriptions: http://m.sciencemag.org/content/346/6208/1257998.figures-onl...
Here's a fascinating talk by the Nobel laureate behind this technique, titled "Imaging Life at High Spatiotemporal Resolutions": http://youtu.be/2R2ll9SRCeo