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## Latest Articles

### Why the Brain’s Connections to the Body Are Crisscrossed

In all bilaterally symmetrical animals, from humans down to simple worms, nerves cross from one side of the body to the opposite side of the brain. Geometry may explain why.

### The Colorful Problem That Has Long Frustrated Mathematicians

The four-color problem is simple to explain, but its complex proof continues to be both celebrated and despised.

### The Symmetry That Makes Solving Math Equations Easy

Learn why the quadratic formula works and why quadratics are easier to solve than cubics.

### Can Our Brains Be Taken Over?

Several real-life pathogens can change a host’s behavior against their will. Here’s what we know about these zombie-like infections.

### When Does the Brain Operate at Peak Performance?

The critical brain hypothesis suggests that neural networks do their best work when connections are not too weak or too strong.

### The Basic Algebra Behind Secret Codes and Space Communication

Whether you’re passing secret notes in class or downloading images from a space probe, Reed-Solomon codes offer an ingenious way to embed information and correct for errors.

### What Does It Mean to Align AI With Human Values?

Making sure our machines understand the intent behind our instructions is an important problem that requires understanding intelligence itself.

### The Simple Geometry Behind Brownie Bake Offs and Equal Areas

Proving that two polygons have the same area can be as easy as cutting them up and rearranging the pieces.

### How to Think About Relativity

Albert Einstein’s ideas about space-time aren’t exactly intuitive, and they aren’t exactly Einstein’s, either.