As the World Cup final approaches, take a moment to appreciate the beautiful symmetries of humanity’s favorite truncated icosahedron.

Combining math concepts with sports can help boost your fractions game.

what if the spaces and objects of tomorrow are not mass produced, but meticulously crafted? in crafting the future, we explore what it means to be a maker today.

A project to turn nuclear warheads into safe electricity was astonishingly successful in the post-Cold War era. Could it happen again?

A list of many of the RSS feeds that I use.

A collection of students' favorite problems from my fall 2022 Introduction to Abstract Algebra I class.

By emphasizing the number of people killed per mile rather than deaths per capita, traffic safety groups risk normalizing the factors that make American roads so deadly.

The gift I made for Gathering 4 Gardner in 2026, together with files so you can make more at home.

A postcard designed for the 2025 plotter postcard exchange #ptpx based on 'Potato Printing,' a game that M.C. Escher played with his kids.

A postcard designed for the 2025 plotter postcard exchange #ptpx based on 'Potato Printing,' a game that M.C. Escher played with his kids.

Based on a delightful video of people forming a 'human rhombic dodecahedron,' I look for other examples of human polyhedra with some help from an LAPL librarian.

Designing a shelf based on the 'squaring the square' problem

Polyhedral postcard #plot-party!

(This challenge exists to extend sequence A276272 in the On-Line Encyclopedia of Integer Sequences, and perhaps create a new OEIS sequence1.) This is a code-challenge, which will have you write cod...

An RSS feed based on searches on the On-Line Encyclopedia of Integer Sequences

The forgotten janitor who discovered the logic of the mind