Scientists say they have created a robotic fish that swims like the heartbeats.
Harvard University researchers teamed up with Emory University researchers to create the first fully autonomous bio-hybrid fish.
The artificial fish was made from human heart cells.
It is able to move because it recreates the muscle contractions of a pumping heart.
Scientists believe this technology will help them study heart conditions like arrhythmia and could one day lead to them being able to build an artificial heart.
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