The cover letter is an essential document when submitting a job application. Here you can learn about what function a cover letter should serve.

Penny invents a quiz to find out whether Sheldon or Leonard is smarter, which only reveals that both of them are completely uninformed about popular culture with the exception of Star Trek.

Have you ever wondered why English seems to have roots in so many different languages? Here is a look at what words the Anglo-Saxons and Vikings brought to the English language.

Minidisco presents a song that reviews the names of the family members as well as the names of the different fingers! Enjoy!

Jimmy Fallon can't believe he's at the White House on the Fourth of July. Watch part of his stand-up performance from that evening in which he does impressions of ten other comedians!

In this week's Lightning Round, Neil Patrick Harris and Billy Eichner take to the streets to find out how New Yorkers feel about the end of the series How I Met Your Mother.

Red meets David's friends Debs and Darrell, and their children Charlie and Holly. While playing hide and seek with Charlie and Holly, Red finds the perfect hiding place.

Barney never fails to impress the group with the lengths he'll go in order to get a woman interested in him.

Red simply doesn't want to wake up for school! David struggles to get him out the door, but there is something important that he is forgetting...

This video shows us that Shakespeare invented over 2000 new words and phrases, such as "eyeball," "anchovy," and "puppy."

From time to time, we give celebrities a chance to read some of the mean things people tweet about them. We extended that same offer to our Commander in Chief, who happily agreed. This is an all President Obama edition of #MeanTweets.

For the body and the mind: Try out some knee exercises and learn some new vocabulary related to posture and fitness. Enjoy!

UNICEF Goodwill Ambassador Katy Perry delivers a special weather report on the devastating effects of climate change for the world’s children.

In 1066, William the Conqueror invaded Britain and brought with him fancy French words to add to the English language.

American adult animated sitcom "Family Guy" has been nominated for and won many awards. In this scene, Peter brings home an unexpected new pet for the family.