california Retired educator teaches youth geometry and math through quilting, and they love it Rusty Blazenhoff
geometry The Gömböc is an object with only one two equilibrium points, one stable and one unstable Mark Frauenfelder
music Cathryn Aison and Philip Glass's lovely abstract animation for Sesame Street (1979) David Pescovitz
Science Embodied logic: Using stimuli-responsive materials and geometric principles to create smart objects Cory Doctorow
happy mutants A ball that inverts and changes color when it is midair, and the scientific literature that explains it Cory Doctorow
politics "The efficiency gap": understanding the math behind a crucial Supreme Court gerrymandering case Cory Doctorow