Thanks to a new discovery, atomic clocks of the future might be handheld instead of the size of a refridgerator.

How Pi Took Over The World

The endless number has been useful, puzzling, and an obsession.

How a Single Cell Solved a Complex Math Problem

One small amoeba found a solution to the traveling salesman problem …

Michelle Obama on Better STEM Education for Girls

The former first lady tells Seniorhelpline how STEM education in …

How Strong Is The Hulk? We Did the Math.

We did the math to see just how strong he really is.

We Already Know How To Build a Time Machine

It’s just a matter of time before we build a machine that can take us into the far future.

The Mysteries of the Golden Ratio Explained by Math and Sunflowers

This number, approximately 1.62, has fascinated mathematicians and artists for centuries—but perhaps not for the reasons you thin…

This Etch A Sketch History of Calculus Helped Get a Kid Into Caltech and MIT

Iowa teen Dezell Turner's hobby gave this college applications a serious boost.

Solution to Riddle of the Week #55: Edgar Allan Poe's Riddle Poem

Difficulty level: Hard

Riddle of the Week #55: Edgar Allan Poe's Riddle Poem

Difficulty level: Hard

Solution to Riddle of the Week #54: The Hardest Logic Puzzle Ever

Difficulty level: Hardest Ever

Riddle of the Week #54: The Hardest Logic Puzzle Ever

Difficulty level: Hardest Ever

Solution to Riddle of the Week #53: Knights and Knaves, Part 11

Difficulty level: Hard

Riddle of the Week #53: Knights and Knaves, Part 11

Difficulty level: Hard

Pi Makes Perfect Sense in These Simple Animations

We all know pi is (roughly) 3.14, but where did that number come from?

The "Müller-Lyer Pulsating Star" Is Our New Favorite Optical Illusion

The line segments are the same length. Really.

Solution to Riddle of the Week #52: Knights and Knaves, Part 10

Difficulty level: Hard

Riddle of the Week #52: Knights and Knaves, Part 10

Difficulty level: Hard

Riddle of the Week #51: Knights and Knaves, Part 9

Difficulty level: Very Hard

Solution to Riddle of the Week #51: Knights and Knaves, Part 9

Difficulty level: Very Hard