In which John Green teaches you the history of the Indian Ocean Trade. John weaves a tale of swashbuckling adventure, replete with trade in books, ivory, and timber. Along the way, John manages to cover advances in seafaring technology,...

It's Grammaropolis, not gramma-opolis, in this musical introduction to the eight parts of speech (plus Slang, the enemy of proper grammar everywhere).

Host Gugulethu Zuma-Ncube introduces the unusual yet fascinating forms of ethnographic African currencies; from personal adornments such as beads, shells, jewelry and even massive iron forms weighing as much as 100 pounds, to the...

Howcast - With a little magic you can add color to this great trick.