Quantum Mechanics Is 100 Years Old—Here’s How It Completely Shaped the World We Live in Today

This year, we celebrate a full century since science took a quantum leap (pun very much intended) and completely changed our understanding of the universe. Quantum mechanics didn't just revolutionize physics—it transformed our everyday lives in ways that most people don't even realize.

But before we get to that, let's go back to 1925, when the world of physics was on the brink of something big.

Before quantum mechanics, classical physics—built on Newton's laws—was king. Scientists believed that if you knew an object's position and velocity, you could predict its future with certainty. The world seemed orderly, predictable, and deterministic.

But there were cracks in this perfect picture. Experiments with light, electrons, and atoms weren't behaving the way classical physics said they should. Something was missing—a whole new way of thinking about reality.

And then, in 1925, everything changed.

1925: The Birth of Quantum Mechanics

In one of the most revolutionary years in science, two competing but equally groundbreaking mathematical frameworks were introduced:
Werner Heisenberg developed matrix mechanics, which described quantum systems in terms of probability rather than certainty.
Erwin Schrödinger introduced wave mechanics, showing that particles could also behave like waves.
These weren't just abstract theories—they meant reality itself wasn't as solid as we thought. Electrons didn't just "orbit" an atom like planets around the sun; instead, they existed in clouds of probability, only taking a definite position when observed.
Physics had officially entered the quantum realm.

via Nobel foundation
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The Avengers-Level Crossover of Physics

With quantum mechanics now a reality, the greatest scientific minds of the 20th century gathered in 1927 at the Solvay Conference to debate what it all meant.
Picture it: Albert Einstein, Niels Bohr, Marie Curie, Max Planck, Erwin Schrödinger, Werner Heisenberg, and Paul Dirac—all in one room.
Einstein famously hated the idea that nature was ruled by probabilities and uncertainty, arguing that "God does not play dice with the universe." Bohr, on the other hand, embraced this strange new world, defending the uncertainty principle and the idea that particles don't have definite properties until measured.
This debate shaped the future of science and led to some of the biggest technological breakthroughs in history.
But what does quantum mechanics have to do with us? Everything.
Quantum mechanics isn't just some abstract theory locked away in physics textbooks—it's the reason our modern world exists. From smartphones to MRI machines, quantum principles power almost every piece of advanced technology we use today.
Here are just a few everyday things that only exist because of quantum mechanics:

via Benjamin Couprie
Computers & Microchips

How it works: The transistors in your phone, laptop, and gaming console rely on quantum tunneling, where electrons "jump" through barriers that classical physics says they shouldn't be able to cross. Without this effect, modern computing wouldn't exist.

via pedrovenancio72
Lasers (CDs, barcode scanners, fiber optics)

How it works: Quantum mechanics explains how atoms absorb and emit light, allowing us to create powerful, precise beams of energy. No quantum physics? No lasers. No lasers? No fiber optics and no world wide web

via Henrik5000
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MRI Scanners (Medical Imaging)

How it works: MRI machines use nuclear magnetic resonance, a quantum phenomenon, to take detailed images of the human body, revolutionizing medicine by allowing us to look inside the body in amazing detail without having to cut you up (which is nice).

via Ceren Demir
GPS & Atomic Clocks

How it works: GPS satellites rely on extremely accurate atomic clocks that use quantum physics to keep time. Without quantum mechanics, your navigation apps would be off by miles.

via Juststock
LEDs & Solar Panels

How it works: The ability of semiconductors to emit or absorb light comes directly from quantum mechanics, making LED screens, energy-efficient lighting, and solar power possible.

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Quantum Mechanics Changed the World—And It’s Just Getting Started

100 years ago, quantum mechanics shattered our understanding of reality. Today, it's the foundation of everything from computing to clean energy to medical breakthroughs. And we're just scratching the surface.
With quantum computing, teleportation experiments, and the possibility of new materials that defy classical physics, we're on the brink of even bigger discoveries.
So next time you check your phone, hop in a GPS-guided Uber, or even turn on the lights in your house, just remember: it's all thanks to the mind-blowing discoveries made a century ago.
Happy 100 years of quantum mechanics!

via Orhan Turan