2018 Nikon Small World in Motion Competition
Above my favorite (second place):
I recommend take a look both winning videos and honorable mentions.
Of course the winner is awesome too:
Zebrafish embryo growing its elaborate sensory nervous system (visualized over 16 hours of development). Technique: Selective Plane Illumination Microscopy (SPIM). Dr. Elizabeth Haynes – Jiaye “Henry” He. University of Wisconsin – Madison