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mathematics "Einstein Tile" mystery solved: amateur mathematician discovers unique 13-sided "hat" Mark Frauenfelder
Boing Boing Gadgets The original kilogram can be yours with this cool, stunningly accurate recreation Boing Boing's Shop
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class war Top tech grads are increasingly unwilling to work for Big Tech, viewing it as a new, unethical Wall Street Cory Doctorow
happy mutants Do Not Erase: Jessica Wynne's beautiful photos of mathematicians' chalkboards Cory Doctorow