To show and then play a movie, click on the arrow or the movie title/description. Repeat to hide it.

UM L1 Movie 1: Pulling String #2 on the Mystery Tube

UM L1 Movie 2: Pulling String #3 on the Mystery Tube

UM L1 Movie 3: Pulling String #4 on the Mystery Tube

UM L1 Movie 4: Pulling several strings