Zebra fish are gaining popularity compared to lab mice - their heart, for example, seems to be a remarkable model for the human heart, despite it looking completely different. But: Their heart has one superpower the human heart has not - which motivates people to use lasers to shoot at it. Why? And is it worth it? You decide.

Music by Tchaikovsky, Chopin played by Edward Neeman, Vienna Ditto, Malaventura, Airglow, Chris Zabriskie and Portrayal. Beating heart sound by Mike Koenig, Intro based on a sample by Vienna Ditto. Produced by Dennis Schulz and Annika Brockschmidt. Photo by zebra danio / flickr (CC-BY).

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