As a surprise special guest, Carly Simon joined Taylor Swift on stage to sing "You're So Vain" together. It was the second night of Swift's sold-out Red Tour at the Gillette Stadium in Foxborough, Massachusetts. This video features some excerpts from the performance, as well as backstage footage and interviews with Carly and Taylor.

Judging by the 26 billion views on over 2 million YouTube videos of them, one thing is certain: cats are very entertaining. But their strange feline behaviors, both amusing and baffling, leave many of us asking: Why do cats do that? Tony Buffington explains the evolutionary history behind some of your cat’s strangest behaviors.

James Corden and Ed Sheeran go for a drive in Los Angeles singing songs off Ed's new album. James challenges Ed to fit as many Maltesers as possible in his mouth after hearing that Ed once fit in 47. Maltesers are a UK brand of chocolate-covered malted milk balls.

Meghan and Harry talk about meeting each other's families, and the design of the engagement ring, which includes diamonds that belonged to Princess Diana.

Rachael and Maggie have some doubts about telling Julia what they saw on one of their walks. In terms of language, this segment nicely captures how often the word “really” is used in conversation.

The band The Specials was formed in Coventry, UK in the late 70's. They stood apart from the prevailing punk scene due to their ska influence and more upbeat way of conveying political messages.

This segment of the BBC interview with Prince Harry and Meghan Markle focuses on how Meghan's life has changed as she leaves acting behind and gets ready to take on a role in the royal family.

The last segment focuses on Australia. We visit the Warrawong Earth Sanctuary, where there are breeding programs to reintroduce such indigenous animals as bandicoots and quolls, creatures that came close to extinction.

Sigrid gets to work in the kitchen and talks her way through preparing and cooking dinner, almost as if you were there with her. You'll notice she uses either the "will" future ("I will" or "I'll") or the phrase "going to" (often reduced to "gonna") to talk about each next step.

R.E.M. talk about the creative process involved in the making of their albums. Collapse Into Now, their final album, was produced by Jacknife Lee, who has also worked with artists such as U2 and The Killers.

Written by John as an expression of his love for Yoko Ono, the song is heartfelt and passionate. As John told Rolling Stone magazine in 1970, “When it gets down to it, when you’re drowning, you don’t say, ‘I would be incredibly pleased if someone would have the foresight to notice me drowning and come and help me,’ you just scream.”

Meghan and Harry talk about their relationship in and out of the public eye. Harry places a lot of emphasis on the royal family being a team and how Meghan is perfectly suited for it.

Made in Dagenham tells the story of women and their fight for equal pay at a Ford plant in Dagenham, England in the 1960s. The film centers around Rita O'Grady, a shop steward, who leads the women machinists to strike.

Thomas invites Julia to a cafe. She's nervous beforehand and almost calls it off, but Rachael and Maggie help her maintain her confidence and pick out a nice outfit.

Sigrid talks to us while preparing some simple vegetables for dinner on her terrace in Italy. Fresh green beans, also known as "string beans," are the centerpiece of the meal.