Lenni is composing lyrics for an original song.

This clip explains that humans are creatures of rhythm and repetition. It describes what poetic repetition is and why it works using several examples as support.

The numbers predict the next set of colors in the pattern to cross the river.

During Christmas, the narrator poetically describes The Grinch's lonely childhood and why he feels that it is the worst day of the year.

John Green explains the beginning of the US government, Washington's Presidency, and the start of Political Parties.