Last month, we post­ed a daz­zling clip – Hans Rosling trac­ing health trends with­in 200 coun­tries over 200 years, using 120,000 data points, all in 4 min­utes. Pret­ty quick­ly you saw why Rosling has earned a rep­u­ta­tion for pre­sent­ing data in extreme­ly imag­i­na­tive ways. The video was an out­take from a BBC doc­u­men­tary called “The Joy of Stats,” which is now ful­ly avail­able online. It runs 59 min­utes and takes you on a “roller­coast­er ride through the won­der­ful world of sta­tis­tics.” When it’s all over, you’ll nev­er doubt that stats can change how you under­stand our world.

The Joy of Stats will be added to our col­lec­tion of Free Doc­u­men­taries Online, a sub­set of our col­lec­tion, 4,000+ Free Movies Online: Great Clas­sics, Indies, Noir, West­erns, Doc­u­men­taries & More.

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In 1977, Bruce and Katharine Corn­well used a Tek­tron­ics 4051 Graph­ics Ter­mi­nal to cre­ate ani­mat­ed short films that demys­ti­fy geom­e­try. The films have now reemerged on the Inter­net Archive. Jour­ney to the Cen­ter of a Tri­an­gle appears above. You can also watch Con­gru­ent Tri­an­gles, which fea­tures the mem­o­rable ‘Bach meets Third Stream Jazz’ musi­cal score. Enjoy.

In 1995, Sir Arthur C. Clarke, the futur­ist and sci­ence fic­tion writer most well known for his nov­el 2001: A Space Odyssey, pre­sent­ed a tele­vi­sion doc­u­men­tary on the 1980 dis­cov­ery of the Man­del­brot Set (M‑Set). Frac­tals: The Col­ors of Infin­i­ty brings us inside the world of frac­tal geom­e­try, and soon enough we’re encoun­ter­ing what has been called “the thumbprint of God.” Clarke nar­rates the film, which has a 54 minute run­time. David Gilmour (gui­tarist, vocal­ist and song­writer for Pink Floyd) cre­at­ed the sound­track. Big hat tip to Greg for send­ing along…

Note: You can pur­chase online the DVD of the doc­u­men­tary, along with the orig­i­nal book on which it was based.

Heights, I hate them. But Skip Garibal­di, a pro­fes­sor of math­e­mat­ics at Emory Uni­ver­si­ty, does­n’t mind them much, and here he describes how math fig­ures into his pas­sion for rock climb­ing – how it makes the dif­fer­ence between a safe climb and a poten­tial­ly dan­ger­ous one. Includes a quick trip to El Cap­i­tan, a 3000 foot ver­ti­cal climb in Yosemite Nation­al Park…