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The Big Bang Theory

The Tangerine Factor - S1-E17

Corrected entry: When Penny and Leonard are talking to Sheldon about their date, Sheldon refers to Schrodinger's Cat, stating "The cat in the box is both alive and dead, until you open the box and find out." Yet the precise point of the Schrodinger's Cat example is that the cat cannot be both alive and dead. Schrodinger was arguing against physicists of the time who claimed that certain subatomic particles were special and could be in opposite states at the same time; his argument was that you can't make small systems special because a large and obvious system (e.g., the cat) could always be made to depend on the state of the smaller one, and for a large and obvious system to be in opposite states simultaneously is ridiculous. Now, this is pretty obscure and the misunderstanding of Schrodinger's Cat experiment is widespread, but this is Sheldon we're talking about.

Correction: This is not a factual error on Sheldon's part. He explicitly says that Schrodinger's experiment was an attempt to explain the Copenhagen interpretation of quantum physics, which implies that the cat could be both dead and alive until the box is opened and observed. While he doesn't explain that the point of the experiment was to critique the prevailing thought of the time, his overall point to Penny fits within the context as given.

The Tangerine Factor - S1-E17

Corrected entry: Penny storms into Sheldon and Leonard's apartment to throw her boyfriend's iPod out of their window and yell at her boyfriend who has just left. Raj then finds the iPod on his way in. However, according to the layout of the building with the front door being to the left of the elevator, the front side of their apartment building would be on Penny's side, so she should have thrown it out of her own apartment window. The window through Sheldon and Leonard's apartment would lead to the back.

New this week Correction: There's no indication from the scene that she's catching him as he is stepping out the door. He could have had his car parked behind the building and was on his way round to the front.

The Locomotive Manipulation - S7-E15

Corrected entry: Sheldon asks whether the train carriage has "link-and-pin" type couplers, when he would know that such couplers were outlawed by the Safety Appliance Act of 1893.

New this week Correction: It would easy to Sheldon to forget, or ignore, this fact when he is aboard a train that has been restored to its original design; internally and externally. He has been building toy models since he was a kid. He just wanted to know to what level this train has been restored.

The Terminator Decoupling - S2-E17

Corrected entry: On the train, the guys reference an eleven-hour train ride from Pasadena to San Diego, but it's only a 4 hour ride, at most.

New this week Correction: The train was actually headed to San Francisco and made at least one stop when Summer Glau got off the train, since Pasadena is nearly 350 miles from San Francisco and it was not a nonstop route, the ride could take approximately eleven hours.

The Friendship Algorithm - S2-E13

Corrected entry: When Sheldon was stuck in an infinite loop in his "friendship flowchart", Howard created an escape which he labeled "LDA"; however, Sheldon referred to it as "Least Objectionable Activity", which would be "LOA."

New this month Correction: It is easy for a D to look like an O.

Pilot - S1-E1

Corrected entry: At the end of this episode when Penny asks to use Leonard and Sheldon's bathroom for a shower, when she goes down the hallway towards the bathroom/bedrooms, she turns past the bathroom (the door that is visible from the living room) and turns right and goes towards the bedrooms.

Correction: Penny could simply be going to grab a towel from the linen closet before having her shower.

The Adhesive Duck Deficiency - S3-E8

Corrected entry: There is no way Sheldon would have been able to hear Penny call him for help as as he did, through four closed doors, two rooms and a hallway.

Correction: Sheldon's 'Vulcan hearing' is an important plot device, used in a number of episodes for comic effect. This is one of them.

The Extract Obliteration - S6-E6

Corrected entry: Sheldon mentions that he scores a double letter score with a triple word score. On the Words with Friends board, this is impossible.

Correction: That is totally possible when you play on a random board, which has the bonus squares in different places. I have played it with an opening word point total of over 225.

The Raiders Minimization - S7-E4

Corrected entry: When Leonard and Penny are doing the 'business' at the university and Howard knocks on the door, Leonard opens and says "hey Si" (Howard's real name - Simon Helberg).

Correction: He says "Hey, sorry," while panting - he's apologising for taking so long to answer the door.

The White Asparagus Triangulation - S2-E9

Corrected entry: Sheldon is an obsessive compulsive and picky person and he picks a pre-designated seat in all places. Yet when he enters Penny's apartment to talk to her he promptly sits on the couch, which was not where he chose 'his seat' to be. It seems out of character that he would sit there when he has a ready-chosen spot and that his nature is as it is.

Correction: It's established in S2 E18, the Work Song Nanocluster, that Sheldon has not picked a spot in Penny's apartment, perhaps owing to the fact that he rarely sits down there. Sheldon is looking for a spot until Penny tells him to sit and he just sits on the couch. In Season 5 E2, the Infestation Hypothesis, Sheldon "picks" Penny's chair, but finds out that she found it on the curb. For whatever reasons, Sheldon has not "picked" a spot of which we are aware, in Penny's apartment. I believe it is just that he is not "sitting" there enough. Not really out of character.

The White Asparagus Triangulation - S2-E9

Corrected entry: Sheldon obviously changes the relationship status on Leonard's Facebook page to 'in a relationship with Stephanie Barnett'. At this point it would have been impossible for Penny to see the status update, because it only shows up after both parties have confirmed it.

Correction: You can see that a person is in a relationship before it is approved by the other person. It would simply say "[Name] is in a relationship" without the other person's name until it is approved, at which point it would say "[Name] is in a relationship with [other name]".

The Bat Jar Conjecture - S1-E13

Corrected entry: When the guys are practising for the Physics Bowl and they are sitting across from Penny, Leonard is sitting in Sheldon's seat, which Sheldon would never allow.

Correction: In most cases, this would be true. But given the way things were set up, he had to pick a new, temporary spot for the practice. It's likely that their living room setup is too complex to change just for a short amount of time, which is why the practice area was set up as it was. Sheldon chose a spot related to the practice area so he would be comfortable, just like he chose a new spot when the gang went to the north pole.

The Roommate Transmogrification - S4-E24

Corrected entry: Bernadette tells Howard that she chose the premature ejaculation project because neither of them has any heart diseases. However Howard has stated more than once that he has transient idiopathic arrhythmia. Also in the previous episode he actually emphasizes that his family has a history of heart diseases and alludes to a cave painting showing one of his ancestors clutching their chest.

Correction: Transient idiopathic arrhythmia is not a disease, it is a disorder. They are different things.

The Justice League Recombination - S4-E11

Corrected entry: At the end of the episode, when Sheldon imagines going to the Grand Canyon to scream about Leonard, that's not the Grand Canyon, signs not withstanding. The location is Dead Horse Point State Park in Utah (near the town of Moab), with the view looking roughly south into Canyonlands National Park. [GPS near 38°28'12" by 109°44'30".] It's several hundred miles upriver from the Grand Canyon. [At least it is along the Colorado River.] The first national park sign looks authentic, but the small one at the overlook is fake, since that's not the Grand Canyon. And by the way, since it's just after New Year's, there would likely be snow at both the Grand Canyon and Dead Horse Point; the images used are not winter scenes.

Correction: But it's all occurring in Sheldon's mind. He does have an eidetic memory, but if he has never been to the Grand Canyon he can't remember it. He's imagining what it would look like if he were there.

The Herb Garden Germination - S4-E20

Corrected entry: Sheldon's laptop has gone through several strange transformations throughout the series, but in this episode it takes the biscuit - it appears to be a Dell XPS with the back covered up, but the shot of Sheldon chatting only to Amy shows that it's apparently running MacOS X.

Correction: It is possible, though difficult, to run OS X on a PC. Given the technical genius of all four of the male leads, they could easily have done it. It could also just be a custom browser skin.

The Cushion Saturation - S2-E16

Corrected entry: At the end, Sheldon fires 5 shots at Leonard, who somehow ends up with 7 distinct paintball marks on his chest.

Correction: Paintball markers can easily fire two shots per trigger pull, especially when the CO2 in the tank is low.

The Nerdvana Annihilation - S1-E14

Corrected entry: At the beginning, when Leonard has won the online auction, we see a shot of his laptop computer screen showing an Apple Safari browser window with Mac OS X window controls, but the laptop is a PC, not made by Apple. Mac OS X can only run on Mac hardware.

Correction: It is difficult but possible (and a TOS violation) to get Mac OS X to run on a PC. The company Psystar even did it commercially. Given Leonard and Sheldon's computer knowledge, it shouldn't be difficult at all. Or they could easily just be running a custom browser skin.

The Zarnecki Incursion - S4-E19

Corrected entry: If Howard can hack into Blizzard's database so deeply that he can get the name and address of game players, he could easily restore all of Sheldon's stolen 'items'. Hacking personal details - a player's real identity and their home address! - is hardcore, detailed work that only an expert could do, compared to which adding a few extra items to a player in the game would be child's play.

Correction: Hacking the database to return items to Sheldon's account would also be traceable to Sheldon's account as cheating. That would get him permabanned if discovered, not a risk Sheldon wants to take.

The Jiminy Conjecture - S3-E2

Corrected entry: Professor Crawley states he discovered a new species of dung beetle (named after him) in a rain forest in Borneo. That is impossible - dung beetles do not live in damp climates as the fecal matter upon which they live degrades too quickly when moist. You can find dung beetles in Savannah grassland, semi-arid desert, some lightly wooded areas, but a rain forest? Never.

Correction: Never is a big word. Deltochilum valgum and Oxysternon pteroderum are two examples of dung beetles that live in rainforests.

Show generally

Corrected entry: Penny uses different mailboxes along the top row to get her mail.

Correction: My mailbox was changed three times in the three years I lived in my last apartment.

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Quotes

Sheldon: At this point, I should inform you that I intend to form my own team and destroy the very bonds that bind your very matter together and reduce the resulting particulate chaos to tears!
Leonard: Thanks for the heads up.
Sheldon: You're welcome. [Turns to leave.] One more thing,
Leonard: Yes?
Sheldon: It's on, bitch.

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Mistakes

There is not a snowball's chance of Howard becoming an astronaut. He suffers from Intermittent Cardiac Arrhythmia, something about which he is completely open. This is easily detectable by a simple electrocardiogram, which is a fundamental part of the many medical examinations a potential astronaut will have to pass. He wouldn't even be allowed to start basic training.

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Trivia

After Sheldon mentions a molecular sieve, they go over to 4a, their apartment. 4a is a kind of molecular sieve.

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