In the waning light, Paul talks about some safety accessories he dreams of putting on the bike, which is still a work in progress. He also talks about the paint job. All in all, he had fun using his knowledge and also learning new things.

Movie star and straight A student Natalie Portman has homework to do just like any other schoolgirl, and reveals that she sometimes finds herself in the same kind of trouble as a normal teenager.

A 14-year-old Natalie Portman talks with David Letterman and Alec Baldwin about starring in R-rated movies and getting straight As in high school.

Paul goes into detail about what materials he used to construct the electric cargo bike. Some features turned out to be essential, such as the kick-stand.

Gwen Stefani talks about her Christmas album, You Make It Feel Like Christmas, and how Blake Shelton's adjusting to life as People's Sexiest Man Alive.

Building something that works can bring a lot of satisfaction. In this case, it's building bikes. Paul likes figuring things out, and seeing what works and what doesn't. Together with a friend, he embarks on a challenging project: building an electric cargo bike!

Aubrey surprises David Letterman when she reveals the story of the film she's in alongside Hollywood superstar Robert De Niro. The conversation then turns to drinking and the host talks candidly about his past.

Aubrey Plaza and David Letterman talk about both of their shows coming to an end. Now that her show Parks and Recreation is over, Aubrey in particular has some ideas about what she might pursue.

Annette has been creating videos for Yabla for a while, and in this video, she shares her story. Yabla became an important part of her life, and inspires her to learn languages in a natural and effective way.

Kids are asked what the best country in the world is. Since not all of them actually understand what counts as a "country," some of the answers are pretty funny. This humorous video is great for learning about asking questions with words like "what," "why," "where," and "how."

Grimmy rigged up Harry Styles to a heart monitor to see what images would cause an increased heart rate. Will it be Ryan Gosling, a briefcase full of money, Zayn Malik, or purple shoes?

Matthew McConaughey and Hugh Grant starred together in “The Gentlemen," but it seems that this is the first time they’ve really met. Matthew reveals all about ice fishing, while Hugh recounts an unlikely encounter on his wedding day, and a less than successful attempt at political activism.

Sammy Hagar revisits his first Van Halen hit single with his new band the Circle featuring Michael Anthony, Jason Bonham, and Vic Johnson.

When Madonna met Justin Bieber on the sofa of The Ellen DeGeneres Show, the inimitable hostess found a way to tease out some of the stars’ intimate secrets with a rather risqué game of “Never have I ever."

Tom Cruise tells about his experience flying in an F-14 fighter jet. It's an experience not for the faint of heart, and requires a strong stomach!