I think the answer to that would definitely be looking down a microscope and seeing a day old zebrafish’s heart beating and cells whizzing around it’s circulation (blood system).
Second to that would be hearing about the brainbow! In science we using fluorescent tags to mark different things and they have done this in the brain marking different neurons with different colours. Check it out: http://cbs.fas.harvard.edu/science/connectome-project/brainbow
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