Scientists Build a Computer Without Electricity Using Springs and Steel

The concept is rooted in “physical memory,” where materials retain information based on how they are stretched, compressed, or moved. Led by physicist Joey Paulsen, the team designed mechanical systems that can count movements, distinguish patterns such as odd and even inputs, and store force-based data. These functions mimic the logic and memory processes of traditional computers, but without requiring power. The result is a self-contained system that computes through motion alone.

While the idea may seem like a step backward in a digital age dominated by microchips, the implications are highly forward-looking. Mechanical computers are inherently more durable than electronic systems, making them suitable for extreme environments where traditional hardware fails. From high-radiation zones to intense heat or corrosive conditions, these systems could operate reliably where standard processors would break down. This durability opens potential applications in aerospace, industrial machinery, and even medical devices.

Looking ahead, researchers aim to scale the technology into more complex systems capable of advanced computations. Ongoing experiments are exploring how multiple mechanical components can interact to form larger networks, potentially leading to “smart materials” that can sense, decide, and respond autonomously. Published in Nature Communications, the study highlights a new frontier in innovation where computation is no longer limited to electronics, but embedded directly into the materials themselves.