Each episode of "Arthur" runs for half an hour. Episodes usually consist of two completely self-contained 11-minute stories. The episodes usually start off with one of the characters (usually Arthur) speaking towards the audience about a situation within the story followed by the title card. The episodes are separated by a one-to-two-minute live action interstitial called "And Now a Word from Us Kids" (or, in some cases, a variation of that title more specific to its contents). The live action segments almost always feature children from elementary schools (generally in the Boston area) presenting subjects they are currently learning about or projects they have been working on in their classes (the subjects covered here relate to the first cartoon segment in the half-hour). This segment is seen exclusively on PBS telecasts of the show, filling space otherwise used for commercials, which are generally forbidden on PBS. There is also a segment that sometimes appears at the end of the second 11-minute episode called "And Now a Word from Marc Brown" where he shows the viewers how to draw various main characters from the show. In 2007, the show began encouraging viewers to send in "video postcards" (similar to those used in the spin-off show "Postcards from Buster"), which were shown in the interstitials of episodes until the middle of Season 12. Beginning with Episode 151, the show reverted "And Now a Word from Us Kids".