Physics

How to Build a Universe

Is there a name for “unifying theories of the Universe”? For example, I’m a fan of the free energy principle, which…

Special Relativity Explained with a Deck of Cards

Time Is Not the Fourth Dimension

Can we really call time the fourth dimension? If that were true, we would be 4D centipedes, with each segment representing a 3D slice of who we are at any given moment. If you live for 80 years, your centipede would be 80 years long. But if this were true, collisions with…