puzzles My trip through the Starmaze: a world in the 9th dimension Jane Frauenfelder

recreational math The wonders of the isochronous curve Mark Frauenfelder

recreational math 42 was the last remaining number below 100 which could not be expressed as the sum of three cubes – until now Mark Frauenfelder

recreational math This trig problem kept me up too late last night Mark Frauenfelder

recreational math A mathematician explores the cat-and-mouse problem Mark Frauenfelder

recreational math Three interesting infinite series Mark Frauenfelder

recreational math Professor Stewart's Incredible Numbers is a delightful book of recreational math Mark Frauenfelder

puzzles Excellent $5 puzzle book: The Moscow Puzzles: 359 Mathematical Recreations Mark Frauenfelder

lsd Super-trippy interactive visualizer feels like getting high for free Andrea James

Gadgets Boing Boing Gift Guide 2016 Gift Guide

Puzzle Books The Moscow Puzzles, Russia's most popular puzzle book Jason Weisberger

The search for the world's greatest card cheat Sam Munson

fiction The Man Who Sold The Moon Cory Doctorow

guily pleasures Let's put the guilt back in guilty pleasures Mark Dery

The surprising history of hippy crack Linda Rodriguez

gift guide Father's Day Gift Guide Rob Beschizza

Potpourri: the $63,000 machine that transforms pot plants into concentrates. Michelle Goodman