Source: Wonders of Latin America: Puzzling Pyramids of Mexico (http://www.history.com/topics/mexico/videos#wonders-of-latin-america-puzzling-pyramids-of-mexico)

Click on the illustration of Shahrazad (or Scheherazade) below to watch the excellent video about The Thousand and One Nights at learner.org featuring comic book writer Bill Willingham (Fables). At their site you can also read excerpts from the collection and explore a map, timeline, and slideshow about it.

Source: The Thousand and One Nights (http://www.learner.org/courses/worldlit/the-thousand-and-one-nights/)

Note: This video is from the fantastic Khan Academy collection of educational videos.

Source: Red blood cells (http://www.khanacademy.org/video/red-blood-cells?topic=biology)

Renoir, La Loge, 1874 from Smarthistory Videos on Vimeo.

Source: Renoir's La Loge (http://smarthistory.khanacademy.org/renoirs-la-loge)

Note: This video is from the fantastic Khan Academy collection of educational videos.

Source: Early Train Word Problem (http://www.khanacademy.org/video/early-train-word-problem?topic=solving-linear-equations)

Source: Massachusetts 54th Regiment (http://www.history.com/topics/black-history-month/videos#gilder-lehrman-massachussetts-54th)

Click on the illustration of the twins' mother Ammu below to watch the excellent video about The God of Small Things at learner.org. At their site you can also read excerpts from the novel and explore a map, timeline, and slideshow about it.

Source: The God of Small Things (http://www.learner.org/courses/worldlit/the-god-of-small-things/)

Last up in the Open University's "Seven Wonders of the Microbe World" series is the potential for life on Mars.

Nike of Samothrace, c. 190 B.C.E. from Smarthistory Videos on Vimeo.

Source: Nike of Samothrace (http://smarthistory.khanacademy.org/nike-of-samothrace)

sqrt(cos(x))*cos(300x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5

(or just click here) and have a mathematically accurate Valentine's Day!