The former first lady tells Seniorhelpline how STEM education in the U.S. could better serve young women.

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 u…

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…

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

Difficulty level: Hard

Solution to 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

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