Jelly Bot

A team of MIT scientists developed hydrogel-based robots that are virtually invisible under water. A video shows an unsuspecting ryukin goldfish suddenly ensnared in the four arms of a robotic hydrogel claw, produced thanks to 3D printing. To function, these soft robots require a hydraulic connection and a pump, which are not invisible.

⇨ The Verge, “Watch this invisible robot grab a fish out of the blue.”

⇨ Nature Communications, Hyunwoo Yuk, Shaoting Lin, Chu Ma, Mahdi Takaffoli, Nicolas X. Fang, Xuanhe Zhao, “Hydraulic hydrogel actuators and robots optically and sonically camouflaged in water.”