terrified vids on Instagram: "Scientists are now creating fully 3D-printed fish that can swim, flex, and move almost like the real thing. These bio-inspired designs are built with soft, flexible materials and internal “muscles” powered by electricity or light, allowing them to flap their fins and glide through water on their own. Researchers use them to study underwater movement, test sensors, and develop new robotic systems without harming real animals. Some versions even mimic the exact patter