[[caption-width-right:258:The main ''[[http://www.brainpop.com BrainPOP]]'' and ''[[http://www.brainpopjr.com BrainPOP Jr.]]'' cast.[[note]]From L to R: [[RecurringExtra Rita]], [[ButtMonkey Tim]], [[IntelligibleUnintelligible Moby]], [[CheerfulChild Annie]], and [[RecurringExtra Cassie]]. Not pictured, Ben from ''[=BrainPOP=] ELL''.[[/note]]]]

''Dear Tim and Moby,''

''Could you [[DescribeTopicHere describe BrainPOP here]]?''

''From, troper''

Great question, troper! Well, ''[[http://www.brainpop.com/ BrainPOP]]'' is an educational website that uses numerous web cartoon series to teach children (Grade school through high school) different concepts ranging from the Pythagorean theorem to Martin Luther King to Music/TheBeatles to [[BreadEggsMilkSquick the urinary system.]]

The most prominent, and likewise popular, of these series is the "Mysteries of Life" cartoons, which follow Tim and Moby as they answer fan-mail, explaining a different educational concept with each one. Tim is a teenage boy and the main character of the series. Moby is his orange robot.

Other recurring characters are Cassie and Rita, two of Tim's friends who appear in many "Mysteries of Life" videos, along with having a series of their own. There is also Bob, a lab rat who appears in several shorts.

There is a ''[=BrainPOP=] Jr.'' section, which is for younger children, and features many {{expies}} of the main site's characters. Instead of Tim, the main character of the series is a young girl named Annie. Instead of answering letters of a topic, she asks questions about the topic, and, obviously, she answers them herself! Oh, and Moby appears there too with a slightly different personality. Moby's alternate continuities can probably be chalked up to RuleOfFunny.

[[AndAnotherThing Oh, yeah]]. And it [[CashCowFranchise costs money]] (the videos, at least; the minigames introduced in 2011 are free for everyone).

!!This website features examples of the following:

* ABoyAndHisX: A boy and his orange robot.
* {{Adorkable}}: Tim
* ArtEvolution: Tim & Moby looked rather ugly when they first appeared in 1997. In 1998, Tim looks much like an adult and Moby looks much better. Beginning in the "Asthma" video (from 1999), Moby got straighter lines.
* ArtStyleDissonance: Despite the series getting an art evolution, some characters that didn't updated would often look odd against some of the newer characters (compare Tim with Nat).
* BabiesMakeEverythingBetter: "Pregnancy" shows [[ShipperOnDeck a grown-up, married Tim and Rita]] with two children.
* BlackBeadEyes: Any human and animal character.
* BlushSticker: Tim in the "Stress" video... Although in that case it was due to, well, [[ExactlyWhatItSaysOnTheTin stress]].
* ButtMonkey: Tim himself.
* ContinuityNod: In the Fractions episode, many of the robots from other videos on the site, such as Little Jimmy and the Cycloids from the Capitalization video and the Hillbot from the Country Music video, show up at Moby's birthday party.
* DistaffCounterpart: Cassie and Rita would be this to Tim and Moby. Cassie is more like Moby, with Rita being more of the Tim.
** Though when another character like Cassie or Nat is paired with Moby, they take Tim's place.
* DoubleTake: At the beginning of one video, Tim has one when he sees a portrait of Moby wearing a suit, only to discover that Moby was actually imitating it.
* EdutainmentShow: One that is FUNNY!
* ExpressiveShirt: Tim's shirt, as it has [[RunningGag a picture that is always related to the episode's subject]].
* FiveEpisodePilot: Two pilot shorts were produced in late-1997, before the website launched in 1999.
* FourFingeredHands: [[LampshadeHanging Lampshaded]] at the end of the "Metric vs Imperial" movie. Tim explains that we use the decimal system because we have ten fingers and raises both hands up to show ten... only to realize that he's missing two.
* GettingCrapPastTheRadar: Happens a lot, especially in earlier episodes.
* HandcarPursuit: Tim and Moby had a handcar in "Industrial Revolution". They later tried to get away from a upcoming train when they're inside a tunnel at the end, though it turns out the train is on another line.
* HypnoPendulum: Used in one of the older comics (the one about sleep), on Cassie.
* {{Hypocrite}}: Tim in the "Plagiarism" video. It turns out Moby had written his entire speech on his blog beforehand.
* IAteWhat: In the Fractions video, after eating a piece of Moby's cake:
-->Tim: Three-quarters of a cup of...motor oil?
-->Tim: I have to... go to the... bathroom.
-->(Tim runs to the bathroom, then we hear spitting sounds)
* IntelligibleUnintelligible: The robots speak in beeps, but humans can understand them.
* IrisOut: Done at the end of the episode about ''Music/TheBeatles'', when Tim covers his ears after he, Moby and a CaptainErsatz robot band called ''The Robots'' were about to play a song, but all the robots start playing horribly once again. The camera iris stops to allow Tim to say "Oh forget it!" and then closes entirely.
** Several of their other movies end like this.
* ItsPronouncedTroPAY: According to Tim, it's pronounced "[[Creator/JRRTolkien Tolk-een]]".
* {{Jerkass}}: Moby can be this sometimes.
** See the Digital Etiquette episode.
* MoodWhiplash: In the midst of all of the quirky and amusing ''[=BrainPOP=]'' videos are ones that deal with subjects like death, mourning, and extinction. The mourning episode is the biggest TearJerker of all, as it ends with a long, silent tribute to Naomi Kadar, who was a very essential member of the ''[=BrainPOP=]'' crew.
* NakedPeopleAreFunny: In the puberty episode, we see Tim briefly in the shower saying "Whoa." This was while Tim was talking about [[CrowningMomentOfFunny boys' penises becoming bigger.]]
** UpToEleven when Tim and Moby become stranded on a island named "Nude Island".
* NonstandardCharacterDesign: Cassie and Moby are one of the few characters to not have beady black eyes. Though this was changed with Cassie when she was redesigned.
* OhCrap: Tim, upon finding out that he has to talk about [[NoPeriodsPeriod periods.]]
* OncePerEpisode: In most episodes, Tim receives from Moby a letter asking about the episode's subject, and he reads it out loud. It was followed by him explaining information about the subject.
* {{Pun}}:
** A VisualPun in the [[HiccupHijinks Hiccups]] video, after Moby, of course, [[ExactlyWhatItSaysOnTheTin gets the hiccups.]]
-->Tim: They're gone, huh? I didn't even know you had a vagus nerve!
-->(Moby reveals a Las Vegas slot machine in his compartment)
-->Tim: [[LamePunReaction And that is quite possibly the worst joke we've ever done.]]
** In the "Word Problems" episode, Moby said he's going to watch "Kung Fu Cowboys", leaving Tim alone. Instead, he watches "Kong Fu Cowboys"!
** "I think we should use our potential energy to make kinetic energy and run away!"
** "Maybe that's the reason why robots aren't allowed at baseball games".
* ShipperOnDeck: See BabiesMakeEverythingBetter.
* ShoutOut:
** The bus driver in the "Back to School" video wears a ''Franchise/StarTrek'' uniform.
** In the "Capitalization," "Clauses," and "Multiplication" videos, Energon cubes from Franchise{{Transformers}} are mentioned.
** At the beginning of the "Robots" video, Moby is seen playing with [[Franchise/StarWars R2-D2 and C-3PO]] figurines.
*** In the beginning of another episode, Tim is rehearsing his role as Admiral Motti in a school production of ''[[Film/ANewHope Star Wars]]''.
** ''Film/Troll2'' is referenced by name in one video.
** Moby says something about a [[http://tvtropes.org/pmwiki/pmwiki.php/UsefulNotes/FlyingSpaghettiMonster flying spaghetti monster]] in the Dark Matter video.
** Tim sings a song to the tune of "[[Music/{{Survivor}} Eye of the Tiger]]" while going to feed his pet lizard.
** In the letter for the "Diabetes" Video, the name of the person asking the question is RAICHU, and it comes from Celadon City, from Franchise/{{Pokemon}}.
** Moby sings Trollo in the "Clefs and Time Signatures" video.
* At the beginning of the "Dance" movie, Tim hums the [[Franchise/SuperMarioBros Underwater Theme.]]
* StraightManAndWiseGuy: Tim and Moby.
* SuddenlyVoiced: Moby in the Etymology video where Tim installed his speech function. This has GoneHorriblyRight when he begs Tim to give him fifty dollars.
-->Moby: "Hello, Tim. You are my best friend. Thank you for the gift of speech. Now give me fifty dollars!"
* ThisIsWrongOnSoManyLevels: Tim says this at the end of "Problem Solving Using Tables" (the first version).
* UpdatedRerelease: Some of the toons are updated during time. Best examples are one involving the 9/11 attacks, where minor were made after Osama's death, and about rainbows, which is a major remake of the original.
* VocalEvolution / EarlyInstallmentWeirdness: Tim sounded quite different in older videos, and he talked faster because back then dial-up was common.
* WholeEpisodeFlashback: In the "Back to School" episode, Tim slides away many props from earlier episodes such as a breast pad from the "Period" episode, 3D glasses from the "Vision" episode, a mask from the "Skeleton" episode, a letter from the "Heart" episode, and the hat from the "Hair" episode. (The episode premiered in 1999).
* WritingLines: Tim does this at detention at the end of the "Daylight Saving Time" video.