The legendary heavy metal band Metallica performs the ballad "Nothing Else Matters" from their fifth studio album, which was released in 1991. Enjoy!

Kirk tries to reason with the human side of Nurse Chapel's fiancé, Roger, before he and his android are zapped away. This clip is from the episode "What Little Girls Are Made Of" of the legendary series Star Trek.

Rachel's English: Practice relaxing the tongue when saying words and phrases with the "n" consonant. Study with Tom!

In part 9, Robin tries to get Tommy's attention, but he's too busy flirting with other girls. Meanwhile, the tension among the gymnasts is about to boil over!

Samuel Gruber's team films white-tipped sharks and barracuda feeding at night off Cocos Island. Enjoy!

John Legend and Lindsey Stirling perform the song "All of Me" at New York City's Kennedy Center.

Released in 1968, the animated film "Yellow Submarine" was inspired by the music of the Beatles and featured them in person as well. The spirit of 1960s counterculture is well-represented in this trailer. Enjoy!

Alexander is showing us contractions of the negative forms of the verb "to be".

Learn about the Big Ben clock tower, which is to London what the Eiffel Tower is to Paris or the Colosseum to Rome: a symbol of the city.

In part 8, Tommy's having a hard time catching the attention of the girl he likes. Meanwhile, Robin's invited to a party. But it's all a cruel hoax!

Here's some more stunning underwater footage. This time it's hammerhead sharks and stingrays, a wahoo and some striped eels, all filmed near the Cocos Island in the Caribbean. Take a look!

Finally, The Frog King's curse was broken and the prince and princess got married and lived happily ever after.

Alexander Pointer takes us through the conjugations of the verb "to be" in the present tense and explains how to form the contraction (otherwise known as the "short form") for each one.

In part 7, Robin has problems with her stepfather and is threatened by a teammate.

In this episode, Doc Gruber and a colleague are testing a shark repellent. If effective, it could help save the lives of divers, swimmers and surfers all over the world.