So let's say you're Vi Hart and you're doodling in math class, and you decide to dig into the math behind your doodles. You make some videos showing and explaining these doodles and talking really fast, and hundreds of thousands of people on YouTube enjoy them -- and perhaps learn a little something about math from them too. Won't you doodle with Vi now? This is delightfully nerdy. Especially when she gets into the multi-pointed stars. Binary Trees "Your teacher seems to think that drawing and... READ ON

Put on your math shoes and step right into the Friday Free-for-all challenge here at the mentalfloss.com Brain Game. Good luck! Leonard has exactly 44 cents in his pocket. How many different combinations of pennies, nickels, dimes, and quarters might Leonard have? Here is the ANSWER. ANSWER: 31 POSSIBLE COMBINATIONS. Here they are (penny = 1 cent, nickel = 5 cents, dime = 10 cents, quarter = 25 cents): 44 pennies 39 pennies and 1 nickel 34 pennies and 2 nickels 34 pennies and 1... READ ON

When I was in school, A+ was the best grade one could get. 90 was an A-, 95, an A and 100 = A+. Of course, grading systems vary depending on where you grow up. Here are some interesting facts about grading systems used around the world. Denmark In 2007, Denmark replaced its age-old 13-scale grading system with a simpler, 7-step-scale system. They did this to begin to conform to a European standard called the ECTS scale, but also because, hey, 13 possible grades makes for a lot more work for teachers.... READ ON

So I'll go ahead and assume you're aware of King of Kong, the videogame documentary that chronicles an epic struggle to dominate the game of Donkey Kong. Kong was a surprising movie mainly because it was supremely interesting to non-nerds, even though its subject was nominally a video game -- and who wants to watch a movie about a video game, much less a super-old video game? Well, the short answer is of course that the film was about people who play video games, and these days, that category extends to... READ ON