In 2008, a physics lab at UCLA proved that peeling Scotch tape in a vacuum produces X-rays. Not a faint, barely-detectable signal — enough X-rays to image a human finger. The man behind the experiment was Seth Putterman, a physicist whose career has been built on coaxing extreme phenomena out of mundane materials.

The mechanism is the triboelectric effect — the same static electricity you generate shuffling across carpet in socks. When you peel adhesive tape, you're ripping apart two surfaces that have exchanged electrons. In normal air, those charges dissipate harmlessly. But in a vacuum, the voltage between the separating surfaces can spike so dramatically that electrons accelerate to relativistic speeds and slam into the tape's adhesive, producing bremsstrahlung X-ray radiation. The same physics that powers multi-million-dollar X-ray tubes, triggered by a $4 roll of tape.

Putterman didn't stumble onto this by accident. He'd spent decades studying sonoluminescence — the bizarre phenomenon where sound waves can cause tiny bubbles in water to collapse so violently that they emit flashes of light, reaching temperatures hotter than the surface of the sun. A collapsing bubble, smaller than a human hair, briefly creating conditions found in stellar interiors. Putterman's group was among the first to produce stable, repeatable single-bubble sonoluminescence in the lab, turning what had been a scientific curiosity into a controllable experiment.

There's a thread connecting all of Putterman's work: the idea that ordinary systems can concentrate energy to extraordinary densities. A bubble in water shouldn't produce light. Sticky tape shouldn't produce X-rays. And yet, when you understand the physics of charge separation and energy focusing, these aren't anomalies — they're natural consequences of electrodynamics pushed to extremes.

The tape X-ray discovery had immediate practical implications. Researchers speculated about building cheap, portable X-ray sources for field medicine in developing countries — no electricity required, just a mechanical peeling apparatus and a vacuum chamber. The idea of a hand-cranked X-ray machine sounds like something from a steampunk novel, but the physics is sound.

It also raised safety questions nobody had thought to ask. People have been unrolling tape in partial vacuums — industrial coating processes, semiconductor manufacturing, space applications — for decades. Had anyone been getting low-level X-ray exposure without knowing it? At atmospheric pressure, the effect is negligible. But the boundary conditions matter, and Putterman's work forced engineers to actually check.

What makes Putterman's career arc compelling is the consistent bet that tabletop physics still has surprises. In an era where breakthroughs seem to require billion-dollar particle accelerators or orbital telescopes, his lab keeps finding extreme physics hiding in hardware-store materials. Bubbles, tape, sound waves — the ingredients are almost comically simple. The phenomena they produce are not.