Science: 'Biohybrid organisms, which are devices containing biological components, provide a way to study physiological control mechanisms in living organisms and may inspire robotic solutions to various challenges. Lee et al. designed a swimming fish analog using a bilayer construct made of cardiac cells. These cells generate autonomous, rhythmic, antagonistic muscle movements that are either light induced or self paced, thus exploiting both the mechanoelectrical signaling and automaticity of cardiac cells. The biohybrid fish showed increased performance over previous biohybrids and provided insight into how mechano-\electrical signaling can be used for self-paced muscle actuation. '
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