Worms, Springs, and Soft Robots: Tiny Creatures Inspire Giant Leaps

Researchers at Georgia Tech recently unveiled an impressive achievement: a 5-inch-long soft robot that can catapult itself 10 feet into the air – the height of a basketball hoop – without any legs. The design was inspired by the humble nematode, a tiny roundworm thinner than a human hair that can jump many times its body length. 

By pinching its body into tight kinks, the worm stores elastic energy and then suddenly releases it, flinging itself skyward or backward like an acrobatic gymnast. The engineers mimicked this motion. Their “SoftJM” robot is essentially a flexible silicone rod with a stiff carbon-fiber backbone. Depending on how it bends, it can leap forward or backward – even though it has no wheels or legs.

In action, the nematode-inspired robot coils up much like a person squatting, then explosively unbends to jump. A high-speed camera show how the worm curves its head up and kinks in the middle of its body to hop backward, then straightens and kinks at the tail to jump forward. 

The Georgia Tech team found that these tight bends – normally a problem in hoses or cables – actually let the worm and the robot store far more energy. As one researcher noted, kinked straws or hoses are useless, but a kinked worm acts like a loaded spring. In the lab, the soft robot reproduced this trick: it “pinches” its middle or tail, tenses up, and then releases in a burst (about one-tenth of a millisecond) to soar into the air.

Soft Robots on the Rise

Soft robotics is a young but rapidly growing field that often takes cues from nature. Unlike rigid metal machines, soft robots are made of flexible materials that can squeeze, stretch and adapt to their surroundings. Early milestones in the field include Harvard’s Octobot – an autonomous robot made entirely of silicone and fluid channels, with no rigid parts, inspired by octopus muscles. Since then, engineers have built a menagerie of soft machines: from worm-like crawlers and jellified grippers to wearable “exo-suits” and rolling vine-like robots. 

For example, Yale researchers created a turtle-inspired soft robot whose legs switch between floppy flippers and firm “land legs” depending on whether it’s swimming or walking. At UCSB, scientists made a vine-like robot that grows toward light using only light-sensitive “skin” – it literally extends itself through narrow spaces like a plant stem. These and other bio-inspired innovations show how soft materials can create new modes of movement.

Overall, supporters say soft robots can go places traditional robots cannot. The U.S. National Science Foundation notes that adaptive soft machines “explore spaces previously unreachable by traditional robots” – even inside the human body. Some soft robots have programmable “skins” that change stiffness or color to blend in or grip objects. Engineers are also exploring origami/kirigami techniques, shape-memory polymers, and other tricks so these robots can reconfigure on the fly.

Engineering Flexible Motion

Making a soft robot move like an animal comes with big challenges. Without hard joints or motors, designers must rely on material properties and clever geometry. For example, Georgia Tech’s jumper had to include a carbon-fiber spine inside its rubbery body to make the spring action powerful enough. Integrating sensors and control systems is also tricky. As Penn State engineers point out, traditional electronics are stiff and would freeze a soft robot in place.

To make their tiny crawling rescue robot “smart,” they had to spread flexible circuits carefully across the body so it could still bend. Even finding energy sources is harder: some soft robots use external magnetic fields or pressurized air because carrying a heavy battery would weigh them down.

Another hurdle is exploiting the right physics. The nematode-robot team learned that kinks actually help. In a normal rubber tube, a kink quickly stops flow; but in a soft worm it slow-builds internal pressure, allowing much more bending before release. By experimenting with simulations and even water-filled balloon models, the researchers showed that their flexible body could hold lots of elastic energy when bent, then unleash it in one fast hop. The result is remarkable: from rest the robot can jump 10 feet high, repeatably, by simply flexing its spine. These breakthroughs – finding ways to store and release energy in rubbery materials – are typical of soft robotics engineering.

Real-World Hoppers and Helpers

What are all these soft robots good for? In principle, they can tackle situations too dangerous or awkward for rigid machines. In disaster zones, for instance, soft bots can wriggle under rubble or into collapsed buildings to find survivors. Penn State showed a prototype magnetically controlled soft crawler that could navigate tight debris or even move through blood-vessel-sized channels.

In medicine, microscopic soft robots could deliver drugs directly in the body. In one MIT study, a thread-thin soft robot was envisioned to float through arteries and clear clots, potentially treating strokes without open surgery. Harvard scientists are working on soft wearable exoskeletons too – a lightweight inflatable sleeve that helped ALS patients lift a shoulder, immediately improving their range of motion.

Space agencies are also eyeing soft leapers. Wheels can get stuck on sand or rocks, but a hopping robot could vault over craters and dunes. NASA is even imagining novel jumpers for the Moon and icy moons. In one concept, a soccer-ball-sized bot called SPARROW would use steam jets (from boiled ice) to hop many miles across Europa or Enceladus. In the low gravity of those moons, a small jump goes a very long way – scientists note that a robot’s one-meter leap on Earth could carry it a hundred meters on Enceladus. The idea is that dozens of these hoppers could swarm across alien terrain “with complete freedom to travel” where wheeled rovers would stall. Back on Earth, future soft jumpers could help in search-and-rescue missions by leaping over rivers, mud, or unstable ground that would stop conventional robots.

Soft robots are also finding work in industry and agriculture. NSF points out they could become safe helpers on factory floors or on farms, because they comply if a human is in the way. Researchers have even built soft grippers that gently pick delicate fruit without bruising it. The flexibility of soft machines means they can act in places too small or flexible for rigid devices.

In the end, experts believe soft robotics will fundamentally change many fields. From worms to wearable suits to lunar hoppers, this research thread shows how studying tiny creatures can yield big jumps in technology.