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

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Microscopic Robots That Swim, Sense, and Navigate—Without a Brain!

Imagine a tiny robot, smaller than the width of a human hair, moving through its environment, sensing obstacles, and adapting its behavior—all without sensors, software, or a brain. This is no science fiction. Researchers at Leiden University, led by Professor Daniela Kraft and Mengshi Wei, have developed microscopic robots that behave in ways strikingly similar to living organisms. Reported in the Proceedings of the National Academy of Sciences (PNAS), this breakthrough could open a new era in biomedical technology.

Inspired by Nature

The inspiration behind these robots comes directly from nature. Professor Kraft explains, “Animals like worms and snakes constantly adapt their shape as they move, which helps them navigate their environment. Large robots use flexibility in the same way. Until now, microrobots were either tiny and rigid or large and flexible. We wanted to create small, flexible microrobots.”

By mimicking natural flexibility at the microscopic level, Kraft and Wei have created robots that are not only small but also incredibly dynamic. The key is that their movement and behavior emerge naturally from their shape and interaction with the environment, rather than from pre-programmed instructions.

Tiny Yet Remarkable: Facts and Figures

These microrobots are marvels of microengineering:

  • Structure: Flexible chains made of self-propelling segments

  • Material: Synthetic, 3D-printed using a Nanoscribe microprinter in the lab

  • Segment Size: 5 micrometers

  • Bar-Joint Size: 0.5 micrometers

  • Movement: Self-propelling elements

  • Speed: 7 micrometers per second

To put this in perspective, a single robot is only a few tens of micrometers long—far smaller than the width of a human hair—but it can swim, navigate, and adapt in ways that look almost alive.

How They Move

The researchers designed the robots as soft, chain-like structures made up of flexibly connected segments. Using a 3D microprinter, they produced the microscopic chains with incredible precision. When an electric field is applied, the segments start moving. The robot’s flexible design allows it to twist and turn in a life-like manner, giving the impression of swimming.

“What’s fascinating,” says Wei, “is that when the robot slows down or is temporarily stopped, it waves its tail, as if trying to break free. This happens because the elements in the back continue to propel themselves, and flexibility allows this movement.”

This dynamic feedback between shape and motion is what makes these microrobots appear alive. The shape influences movement, and movement, in turn, changes the shape. This continuous interaction allows the robot to sense and respond to its environment without any microscopic electronics.

Life-Like Behavior Without a Brain

One of the most remarkable features of these robots is their ability to navigate autonomously. When they encounter an obstacle, they automatically find an alternative route. When two robots meet, they naturally avoid colliding. They can move through dense environments, even pushing aside objects that block their path.

Professor Kraft highlights, “This continuous feedback loop between shape and motion means we don’t need microscopic sensors or complex electronics to give the robots smart behaviors. The structure itself generates the intelligence.”

This life-like behavior is a major breakthrough in robotics, challenging the traditional idea that intelligence requires a brain or software. The physical design alone is enough to enable complex, adaptive actions.

Biomedical Potential

The implications for medicine and biotechnology are enormous. These tiny, flexible robots could one day be used for:

  • Targeted Drug Delivery: Swimming directly to diseased cells or tissues to deliver medicine precisely where it’s needed

  • Minimally Invasive Procedures: Navigating through the human body to perform diagnostics or even microsurgery

  • Environmental Sensing: Detecting chemical or biological signals inside the body or in other confined spaces

Unlike conventional microrobots, which rely on external control or pre-programmed commands, these robots can adapt in real time to their environment. This flexibility could make medical procedures faster, safer, and far more precise.

Understanding Emergent Behavior

While the robots’ abilities are impressive, the researchers stress the importance of understanding the underlying physics. Kraft says, “We need to fully understand how dynamic and functional behaviors emerge. This knowledge will not only help us develop more advanced microrobots but also improve our understanding of how biological microswimmers—like bacteria or sperm—navigate and respond to their environment.”

By studying these microrobots, scientists can gain insights into the natural world at the microscopic level, potentially revealing principles that apply to both living organisms and future robotic systems.

The Technology Behind the Magic

The creation of these microrobots relies on cutting-edge technology:

  • 3D Microprinting: Using a Nanoscribe printer, the team prints synthetic materials with incredible precision, down to fractions of a micrometer.

  • Soft, Flexible Design: The chain-like structure allows the robot to bend, twist, and respond to external forces.

  • Self-Propelled Elements: Each segment moves autonomously when stimulated by an electric field, powering the entire chain.

This combination of design, materials, and propulsion is what enables the robots to function without sensors, software, or external control—a major departure from traditional microrobotics.

Testing and Discovery

The team experimented with various scenarios to explore what these microrobots could do. Wei recalls, “We found that even in challenging environments, the robots could find alternative paths or adjust their movement. They seem to sense and react to their surroundings without any programmed instructions.”

Kraft adds, “We observed continuous feedback between shape and motion. The robot adapts its movements based on the environment, making it appear almost alive. This could change how we think about designing intelligent systems at microscopic scales.”

Future Horizons

The research opens numerous avenues for future exploration:

  1. Advanced Microrobots: By understanding how shape and motion generate life-like behavior, scientists can design robots capable of more complex tasks.

  2. Biological Insights: Studying these robots could shed light on the mechanics of natural microswimmers and other microscopic organisms.

  3. Medical Breakthroughs: Potential applications include smart drug delivery systems, diagnostics in hard-to-reach areas, and minimally invasive procedures.

  4. Environment Interaction: These robots could be adapted for tasks outside the human body, such as environmental monitoring at a microscopic level.

The work of Kraft and Wei demonstrates that intelligence can emerge from simple physical structures interacting with their environment—a concept that could redefine both robotics and our understanding of life itself.

Conclusion

Leiden researchers have taken a bold step forward by creating microscopic robots that swim, sense, and navigate entirely through their design. Without a brain, sensors, or software, these tiny robots exhibit life-like behaviors, opening exciting possibilities for medicine, biology, and robotics.

As Professor Kraft notes, “The real challenge now is understanding how these behaviors emerge. Once we do, we can create even more advanced microrobots and learn from nature in entirely new ways.”

With these developments, the future of microrobotics promises a world where tiny machines move and act with the autonomy of living organisms—blurring the line between life and technology.

Reference:
Mengshi Wei et al., Life-like behavior emerging in active and flexible microstructures, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2531743123

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