Swimming can take a lot of muscle. But as MIT engineers have found, even a single layer of muscle cells can power through water if designed right. In a paper published Sept. 28 in the journal Advanced Functional Materials, the team presents a design for a thin, muscle-powered swimming robot. The “skeleton” of the aquabot is made from a film of gel about the length and width of a stick of gum. The two halves of the gel form the bot’s “fins.” Each fin is covered with a layer of live muscle cells much thinner than a single strand of hair. The cells are genetically engineered to twitch in response to light.Swimming can take a lot of muscle. But as MIT engineers have found, even a single layer of muscle cells can power through water if designed right. In a paper published Sept. 28 in the journal Advanced Functional Materials, the team presents a design for a thin, muscle-powered swimming robot. The “skeleton” of the aquabot is made from a film of gel about the length and width of a stick of gum. The two halves of the gel form the bot’s “fins.” Each fin is covered with a layer of live muscle cells much thinner than a single strand of hair. The cells are genetically engineered to twitch in response to light.[#item_full_content]