This is pretty neat. Amanda Moor shows us how to make a pretty gift box out of a sheet of paper. You'll need paper, a round dish, a straight edge, a pencil, a protractor, and scissors. And it will help to have some ribbo...

If we're going to have triangles, we may as well g...  ...e triangles, we may as well go whole hog with the geometry analogies. I think we cam all relate to the anxie...

This kid can’t make his mind up whether he w...  ...e somewhere else. It doesn’t look like this geometry

[http://youtu.be/31uATZkJBKo] (YouTube link)Dave Hax explains in detail how to get more of the pizza than you should, or more than you are entitled to. This works much better if you are the one bringing it home, or pulli...

[http://youtu.be/wBU9N35ZHIw] (YouTube link)In 1906, Sir Francis Galton proposed a way to cut a round cake so that the exposed inside does not go stale. For some reason, his method of cutting a cake did not catch on. Num...

Parallel lines have so much in common. It's...  ...re. The looping GIF shows a few lessons from geometry : Parallel lines that never meet...

[http://youtu.be/IXQ1ZWBhnBk] (YouTube link)How can you pass a straight rod through a curved hole? No, neither of the two are pliable. This demonstration at the Science Museum in Valencia, Spain, shows you in just a few...

[http://youtu.be/_n1126GoxbU] (YouTube link)Vi Hart collaborated with mathematical artist Gwen Fisher, her sister Ruth at Sweets by Ruth, and software engineer Andrea Hawksley to make cookies. At least their stated purpo...

Submit a caption! My submission "I hate this game... ...my love is geometrically challenged." That or "Love and Tetris- two things I am inexcusably miserable at." There is no prize, just for f...

[http://youtu.be/VIVIegSt81k] (YouTube link)These hexaflexagons are going to keep my kids busy all night, you can bet on it. Vi Hart's latest video introduces you to the fun of six-sided mathematical origami. "Explore th...