Science fiction has always had a complicated relationship with actual science. Sometimes it's wildly wrong. Sometimes it's uncomfortably prophetic. And occasionally it describes something so specific that you have to wonder whether the writer had access to a research lab nobody else knew about.
The tools are where it gets really interesting. Not the ships or the cities or the grand civilizations — the handheld stuff. The things characters pull out of a pocket or off a workbench. The props that become so iconic they outlast the franchise that invented them.
Here's a look at some of the most famous science fiction tools ever put on screen, and what real science actually has to say about them.
The Lightsaber
Start with the obvious one. George Lucas needed a weapon that felt ancient and elegant in a universe full of blasters, and what he landed on was essentially a sword made of coherent light. Visually perfect. Physically complicated.
The core problem with a real lightsaber isn't generating the light — lasers exist, obviously. It's stopping it. Light doesn't stop at a fixed length unless it hits something. A focused beam of sufficient energy would travel until it hit a wall, a planet, or the heat death of the universe, whichever came first. Not ideal for a duel.
What physicists have actually been working on is photonic matter — a state where light particles interact with each other as if they have mass. In 2013, researchers at MIT and Harvard managed to bind two photons together into a molecule that behaved more like matter than light. It wasn't a blade. But it was a start.
The plasma containment angle is more promising. A contained plasma arc at the right temperature and density could theoretically hold a shape, emit intense light, and cut through most materials with enthusiasm. The engineering challenge is the power source. The kyber crystal handwave in the films is doing a lot of heavy lifting there.
The Voight-Kampff Machine
Blade Runner gave us one of science fiction's most unsettling tools: a device designed not to measure physical capability but emotional response. The Voight-Kampff machine tests empathy through pupil dilation, blush response, and involuntary microexpressions triggered by morally loaded questions. The idea being that a replicant — however sophisticated — would respond just slightly wrong.
This is not as far-fetched as it sounds. Functional MRI and galvanic skin response technology can already detect emotional arousal with reasonable accuracy. Police interrogation has used variants of this for decades, with mixed results and significant controversy around reliability. The deeper problem the film identifies is the philosophical one: if a machine becomes sophisticated enough to fake empathy convincingly, does the distinction still matter? That question has gotten considerably more urgent in the last few years.
The Tricorder
Star Trek's Swiss Army knife of science — point it at something, get information back instantly — was science fiction's way of saying "we'll figure out the sensor problem later." As it turns out, later arrived on schedule.
The Qualcomm Tricorder XPRIZE, completed in 2017, challenged teams to build a device that could diagnose 13 medical conditions from a non-invasive scan. The winning device from Final Frontier Medical Devices weighed under five pounds and diagnosed conditions ranging from anemia to diabetes to atrial fibrillation without a lab or a doctor in the room. It didn't look like the prop from the show. It worked better.
Handheld spectrometers now exist that can identify chemical compounds, authenticate medications, and analyze soil composition from a device the size of a TV remote. The gap between sci-fi and catalog item has closed considerably.
The Sonic Screwdriver
Doctor Who's all-purpose plot resolver has one canonical weakness: it doesn't work on wood. Everything else is fair game — locks, computers, alien technology, narrative convenience.
Actual sonic tools exist and are genuinely impressive, if less dramatically flexible. Focused ultrasound can manipulate objects without contact, break up kidney stones from outside the body, cauterize tissue during surgery, and levitate small particles in mid-air. Acoustic tractor beams — real ones, demonstrated at the University of Bristol — can move physical objects using nothing but sound waves. The frequency and intensity requirements scale badly for most action sequences, but the underlying physics is legitimate.
The Bottom Line
Science fiction's tools endure because they solve problems we recognize — the need for a weapon with presence, a machine that understands truth, a device that knows what's wrong, a tool that opens what needs opening. The science catches up because those problems are real, and real problems attract real researchers.
The gap between a prop on a soundstage and a working prototype is mostly time, funding, and the occasional graduate student with too much coffee and not enough sleep.
Which is its own kind of science fiction story.
Speaking of science fiction tools — our Sci-Fi Tools Hawaiian Shirt features an array of instruments from across the genre, rendered in the kind of detail that rewards closer inspection.
