The combination of charge conjugation, parity, and time-reversal symmetry is known as CPT. And it must never be broken. Ever.
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Do the laws of physics place a hard limit on how far technology can advance, or can we re-write those laws?
Perhaps the most remarkable fact about the Universe is simply that it, and everything in it, exists. But what's the reason why?
How does the mind interact with the body? Nobody really knows — but these philosophers ventured an answer.
Unless you confront your theory with what's actually out there in the Universe, you're playing in the sandbox, not engaging in science.
We cannot deduce laws about a higher level of complexity by starting with a lower level of complexity. Here, reductionism meets a brick wall.
The whole isn't greater than the sum of its parts; that's a flaw in our thinking. Non-reductionism requires magic, not merely science.
The multiverse is an idea that has gained a lot of traction in popular culture. But what does science have to say about it?
Perhaps the whole Universe is the result of a vacuum fluctuation, originating from what we could call quantum nothingness.
A group of prominent scientists shares how research has changed them.
Michael Faraday's 1834 law of induction was the key experiment behind the eventual discovery of relativity. Einstein admitted it himself.
Time gets a little strange as you approach the speed of light.
Nothing lives forever, at least, not in the physical Universe. But relativity allows us to get closer than ever, from one perspective.
Whether you run the clock forward or backward, most of us expect the laws of physics to be the same. A 2012 experiment showed otherwise.
With the right material at the right temperature and a magnetic track, physics really does allow perpetual motion without energy loss.
Empty space itself, the quantum vacuum, could be in either a true, stable state or a false, unstable state. Our fate depends on the answer.
If you can model anything in the Universe with an equation, mathematics is how you get the solution(s). Physics must go a step further.
Despite the enormous mass of the Earth, simply depleting our groundwater is changing our axial tilt. Simple Newtonian physics explains why.
The anthropic principle has fascinating scientific uses, where the simple fact of our existence holds deep physical lessons. Don't abuse it!
Although we still don't know the question, we know that the answer to life, the Universe, and everything is 42. Here are 5 possibilities.
Cosmic inflation is the state that preceded and set up the hot Big Bang. Here's what the Universe was like during that time period.
If you want to understand what the Universe is, how it began, evolved, and will eventually end, astrophysics is the only way to go.
Whether or not life exists elsewhere in the Universe, we can be assured of one thing: We are the only human beings in the cosmos.
Science is for everyone, even those possessing strongly held beliefs that seem to conflict with the best available evidence.
If you look into a mirror, you'll notice that left-and-right are reversed, but up-and-down is preserved. The reason isn't what you think.
Yes, "the laws of physics break down" at singularities. But something really weird must have happened for black holes to not possess them.
We're used to scientists telling us about the math and physics behind astronomical events. But what does studying space make us feel?
First derived by Emmy Noether, for every symmetry a theory possesses, there's an associated conserved quantity. Here's the profound link.
The laws of physics don't prefer matter over antimatter. So how can we be certain that distant stars & galaxies aren't made of antimatter?
Smashing things together at unprecedented energies sounds dangerous. But it's nothing the Universe hasn't already seen, and survived.