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

Golden Ratio Explained by Math and Sunflowers

This number, approximately 1.62, has fascinated mathematicians and a…

Etch A Sketch Calculus Video Gets Kid Into MIT

Iowa teen Dezell Turner's hobby gave this college applications a ser…

Solution to Riddle of the Week #55

Difficulty level: Hard

Riddle of the Week #55

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

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

Difficulty level: Hard

Solution to 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

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

Difficulty level: Very Hard

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

Difficulty level: Very Hard

Why Aren't Helicopters Faster?

How physics explains why the fastest car is faster than the fastest helicopter.

The Equation That Produces a Graph of Itself

Tupper’s Self-Referential Formula describes itself, along with pretty much everything else.

Solution to Riddle of the Week #50: Knights and Knaves, Part 8

Difficulty level: Hard

Riddle of the Week #50: Knights and Knaves, Part 8

Difficulty level: Hard

Solution to Riddle of the Week #49: Knights and Knaves, Part 7

Difficulty level: Moderate