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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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This 3D-Printed Robot Jumps Like a Frog & It Helps Build Machines Strong & Flexible Like Living Organisms

Scientists at Harvard University have developed a new kind of robot that combines soft and hard materials in a way that closely mimics how living organisms are built. This innovation has led to the creation of a durable, soft-bodied jumping robot that can move powerfully, land safely, and operate without breaking easily.

The breakthrough comes from a simple but powerful idea: nature already knows how to build strong yet flexible bodies. Animals and insects do this by smoothly blending hard and soft tissues instead of joining them abruptly. Now, engineers have used the same principle to design robots that are far more resilient than traditional machines.

The Problem with Traditional Robots

Most traditional robots are built like machines on an industrial assembly line. They use metals, screws, motors, and rigid hydraulic parts. These materials are extremely strong, but they are also stiff and fragile in certain conditions.

When engineers try to combine hard mechanical parts with soft materials (like rubber or flexible polymers), a serious problem appears. At the point where soft and hard materials meet, stress builds up. This weak interface often becomes the place where the robot fails or breaks.

This limitation has been a major challenge in robotics, especially for robots designed to interact safely with humans or move through unpredictable environments.

Learning from Nature’s Design

To solve this issue, researchers studied how living organisms are built. In animals and insects, there is no sudden transition between hard and soft parts. Instead, the body gradually changes stiffness from rigid structures (like bones or shells) to softer tissues (like muscles and skin).

This smooth transition helps prevent stress concentration and makes biological systems both strong and flexible at the same time.

Inspired by this natural strategy, a team of researchers at the Wyss Institute for Biologically Inspired Engineering at Harvard University and Harvard’s School of Engineering and Applied Sciences developed a new method to replicate this effect in robots.

The work was led by Robert Wood, a pioneer in bio-inspired robotics, along with contributions from James Weaver, who specializes in advanced 3D printing techniques.

A New Way of 3D Printing Robots

The team developed a special 3D printing process that allows an entire robot to be built in a single uninterrupted session. Instead of assembling separate parts, the robot is printed layer by layer using different materials.

What makes this approach unique is the use of nine gradual material layers. These layers slowly shift from rigid material at the core to soft, flexible material on the outside.

This gradient design eliminates sharp boundaries between hard and soft parts. As a result, stress is distributed more evenly across the structure, making the robot much more durable.

According to the researchers, this is one of the first times a complete robot has been created using a fully integrated stiffness gradient strategy.

The Jumping Robot Design

The result of this method is a small, autonomous jumping robot that does not require wires or external power connections. Instead, it uses an internal combustion system powered by a controlled mixture of butane and oxygen.

This combustion creates a rapid burst of energy that allows the robot to jump forcefully off the ground. The mechanism acts like an artificial muscle that delivers explosive power when needed.

The robot also includes three tilting pneumatic legs. These legs help control the direction of each jump, allowing the robot to move with precision rather than bouncing randomly.

The outer body is soft and flexible, which helps it survive impact when it lands. This soft shell reduces damage and increases the robot’s lifespan, making it more practical for real-world use.

The combustion-based design builds on earlier work by George Whitesides, who has long worked on unconventional robotic systems that use chemical energy instead of traditional batteries.

Why 3D Printing Makes This Possible

One of the biggest advantages of this approach is the use of advanced additive manufacturing, commonly known as 3D printing.

Traditional manufacturing methods use molds and assembly lines. These methods are not suitable for complex designs that require gradual changes in material properties. Each change would require a completely new mold, making the process slow and expensive.

In contrast, 3D printing allows engineers to design and build complex shapes directly from digital models. This makes it easy to experiment, modify designs, and quickly produce new versions of the robot.

As explained by researcher Nicholas Bartlett, this flexibility makes 3D printing ideal for creating functionally graded robots that would be nearly impossible to manufacture using traditional techniques.

Expert Contributions Behind the Innovation

This project brought together several experts from different fields of science and engineering.

Among them was Donald Ingber, who highlighted how combining biology-inspired ideas with modern engineering tools can solve long-standing technological challenges.

Other key contributors included Michael Tolley, Bobak Mosadegh, Johannes T.B. Overvelde, and Katia Bertoldi.

Together, their combined expertise in robotics, materials science, and biomechanics made this breakthrough possible.

Why This Robot Is Important

This soft-bodied jumping robot represents more than just a new machine. It shows a new direction for robotics design.

Key advantages include:

  • Greater durability: The gradual material transition prevents weak points.

  • Safer interaction with humans: Soft outer layers reduce injury risk.

  • Improved mobility: Jumping ability allows movement over rough terrain.

  • Longer lifespan: Reduced mechanical failure increases usability.

  • Autonomous operation: No external wires or connections needed.

This combination of features makes the robot suitable for environments where traditional robots struggle.

Future Applications

The researchers believe this technology could lead to a new generation of robots that can safely work alongside humans.

Potential applications include:

  • Search and rescue missions in disaster zones

  • Exploration of dangerous or hard-to-reach environments

  • Medical robots that operate close to human tissue

  • Industrial robots that interact safely with workers

  • Future household robots that assist in daily tasks

Because the design is scalable, similar techniques could also be used to create other types of soft machines beyond jumping robots.

Conclusion

This innovation marks an important step forward in robotics. By copying nature’s way of building living organisms and combining it with advanced 3D printing, scientists have created a robot that is both strong and flexible.

The work shows that the future of robotics may not depend only on harder materials and stronger motors, but on smarter designs inspired by biology. As research continues, robots like this could become common in everyday life, helping humans in safer, more efficient, and more adaptable ways.

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