This was a winning entry in the 2018 Small World in Motion microvideography competition sponsored by Nikon. (Click the fullscreen icon in the lower right corner for enhanced viewing)
The subject matter is a 40-second timelapse of 16 hours of development of the nervous system in a zebrafish embryo. Watch with awe the budding, branching, and interconnecting of the nerve tissue, and realize that an equivalent process occurred in you and your children. Think then in terms of "what could go wrong," and if nothing went wrong, be thankful for your health and be amazed at the incomprehensible complexity of your body.