Math
We Already Know How To Build a Time MachineIt’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