The combination of charge conjugation, parity, and time-reversal symmetry is known as CPT. And it must never be broken. Ever. The ultimate goal of physics is to accurately describe, as precisely […]

When you hear ‘quantum,’ you probably think of splitting everything into discrete, indivisible chunks. That’s not necessarily right. If you want to learn what the Universe is made out of […]

Traveling interstellar distances in human lifetimes is an amazing dream, but it won’t ever be achieved like this. For centuries, ever since we realized that every star we can see in […]

With the discovery of the Higgs boson, the Standard Model is now complete. Can we be sure there isn’t another generation of particles out there? The Universe, at a fundamental level, […]

The Sudbury neutrino observatory, which was instrumental in demonstrating neutrino oscillations and the massiveness of neutrinos. With additional results from atmospheric, solar, and terrestrial observatories and experiments, we may not […]

Electron-positron or proton-proton colliders are all the rage. But the unstable muon might be the key to unlocking the next frontier. If you want to probe the frontiers of fundamental […]

The laws of physics are not time-reversal invariant. Here’s how we know. No matter when, where, or what you are in the Universe, you experience time in only one direction: forwards. […]

The whole should equal the sum of its parts, but doesn’t. Here’s why. The whole is equal to the sum of its constituent parts. That’s how everything works, from galaxies to […]

Red, green, and blue? What we call ‘color charge’ is far more interesting than that. At a fundamental level, reality is determined by only two properties of our Universe: the quanta […]

Before we formed stars, atoms, elements, or even got rid of our antimatter, the Big Bang made neutrinos. And we found them. The idea of the Big Bang has captivated the […]

But we shouldn’t give up on direct detection. Here’s why. Dark matter is not only the most abundant form of matter in the Universe, it’s also the most mysterious. Whereas all […]

Every physical theory has constants in it. The gravitational constant is remarkably uncertain. When we first began formulating physical laws, we did so empirically: through experiments. Drop a ball off […]

The Universe was born matter-antimatter symmetric. Here’s what happened when the last of our antimatter disappeared. Things happen fast in the earliest stages of the Universe. In the first 25 […]

If our current laws of physics can’t predict what will happen, even probabilistically, we need something new. There are two theories we have that explain all the particles and their […]

Dark energy is pushing distant galaxies apart from one another at an increasing rate. If the Big Rip hypothesis is true, things will only get worse from here. One of the […]

In 2015, Ed Witten, the greatest living string theorist, wrote a piece on why. Here’s the version for everyone. It’s one of the most brilliant, controversial and unproven ideas in […]

A new podcast, to cover an incredible story of why we can exist at all. “Already in my original paper I stressed the circumstance that I was unable to give a […]

This isn’t an XZibit joke; it’s a real scientific question. And the answer may be that it’s possible after all. “People who work every day are kind of scared of things […]

If the LHC can’t produce new fundamental particles, the collisions coming from it still a chance to teach us something incredible. “It was quite the most incredible event that has […]

Gravity is the oldest fundamental force ever discovered. Might it not be fundamental after all? “The whole edifice of modern physics is built up on the fundamental hypothesis of the atomic […]

The force of empty space isn’t always zero. Here’s how an electromagnetic experiment might be the key to dark energy. “Another very good test some readers may want to look up… […]

The idea that there might only be one fundamental force might be a fundamental mistake. “Even if there is only one possible unified theory, it is just a set of […]