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Quantum Mechanics
For decades, theorists have been cooking up "theories of everything" to explain our Universe. Are all of them completely off-track?
No matter what physical system we consider, nature always obeys the same fundamental laws. Must it be this way, and if so, why?
Smashing things together at unprecedented energies sounds dangerous. But it's nothing the Universe hasn't already seen, and survived.
Quantum entanglement links information between particles across space and time. So what happens when one of them falls into a black hole?
The fundamental building blocks of reality are indivisible: quanta that cannot be split or divided. Our understanding remains incomplete.
A century ago, quantum physics overthrew our view of a deterministic Universe. A profound 21st century theorem closes the door even further.
The very word "quantum" makes people's imaginations run wild. But chances are you've fallen for at least one of these myths.
We think of physical reality as what objectively exists, independent of any observer. But relativity and quantum physics say otherwise.
As the lightest baryon in the Universe, the proton is thought by many to be eternally stable. But if it isn't, can we observe it decaying?
From white holes to dark stars and multiverses, James Riordon explores the bizarre exhibits of general relativity's "cryptozoo."
Quantum mechanics was first discovered on small, microscopic scales. 2025's Nobel Prize brings the quantum and large-scale worlds together.
The Holy Grail of physics is a Theory of Everything: where a single equation describes the whole Universe. But maybe there simply isn't one?
Since even before Einstein, physicists have sought a theory of everything to explain the Universe. Can positive geometry lead us there?
Parallel universes are among the most profound notions in all of quantum physics. It's a compelling and fascinating idea, but is it true?
Amplifying the energy within a laser, over and over, won't get you an infinite amount of energy. There's a fundamental limit due to physics.
Realizing that matter and energy are quantized is important, but quantum particles aren't the full story; quantum fields are needed, too.
A meditation on quantum physics, creative endurance, and the unseen forces that shape what lasts.
The ANITA experiment found cosmic rays shooting out of Antarctica. One interpretation claims "parallel Universes," but is that right?
Here in our Universe, time passes at a fixed rate for all observers: one second-per-second. Before the Big Bang, things were very different.
If it weren't for the intricate rules of quantum physics, we wouldn't have formed neutral atoms "only" ~380,000 years after the Big Bang.
The laws of physics obey certain symmetries and defy others. It's theoretically tempting to add new ones, but reality doesn't agree.
Photons come in every wavelength you can imagine. But one particular quantum transition makes light at precisely 21 cm, and it's magical.
The Kalam cosmological argument asserts that everything that exists must have a cause, and the "first" cause must be God. Is that valid?
The Multiverse isn't just a staple of science fiction; there's real-life science behind it, too. Here are 10 facts to expand your mind.
One of the most promising dark matter candidates is light particles, like axions. With JWST, we can rule out many of those options already.
When we divide matter into its fundamental, indivisible components, are those particles truly point-like, or is there a finite minimum size?
Despite no experimental evidence showing that gravitons exist, they remain a respectable concept in the world of professional physicists.
In the year 2000, physicists created a list of the ten most important unsolved problems in their field. 25 years later, here's where we are.
Matt Strassler's journey into fundamental physics culminates in a brilliant explanation of the Higgs field. Enjoy this exclusive interview.
By improving quantum error correction, quantum computations are now faster than ever. But parallel universes? That's utter nonsense here.