The Big Bang Theory

Our whole universe was in a hot, dense state
Then nearly fourteen billion years ago expansion started, wait…

Doesn’t your heart swell when this sing starts playing? This isn’t just show about four geeks and a hot neighbor. This show is the reason a bad day becomes a good one. We all are well versed with the song but how many of these unknown facts do you know? Read on to find out!

1. We still don't know Penny's surname

Unlike the other characters, Penny is the only one whose surname has never been revealed. Reports claim that Kaley Cuoco Sweeting prefers to keep this a mystery throughout the whole series.

Co-creator Bill Prady has said that the name will be revealed eventually, but producer Steve Molaro has said the opposite, so who knows. Unless of course her name is Penny Penny Penny, and Sheldon's knocks make more sense.

2. Jim Parsons has never seen Star Trek

Sheldon is the unofficial King of Geekdom, and is an expert on everything from Marvel Comics to Red Dwarf. However, Jim Parsons isn't quite as clued up in the cult world. Parsons has never actually been a fan of any of Sheldon's favorite TV shows, particularly Doctor Who and Star Trek. He once told Time: "I'm very frank about certain things, I get asked a lot of science things and I'm like, 'you're kidding'. And even the pop culture… I've never seen Star Trek. I don't know Doctor Who."

3. This is what the apartment really looks like

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Have you ever wondered what the layout of the main characters' apartment looks like? Quite how Penny was able to afford such a luxurious apartment on waitress wages for so many years is beyond us.

4. Inspiration behind the characters’ names

The two main characters (Sheldon Cooper and Leonard Hofstadter) are named after late television producer Sheldon Leonard.

5. Amy Fowler was made a neuroscientist on purpose.

Mayim Bialik, who in real life has a PhD in neuroscience, told Variety how Amy Farrah Fowler’s profession came to be. “They didn’t have a profession for my character when I came on in the finale of season three,” she says. “In season four, Bill Prady said they’d make her what I am so I could fix things (in the script) if they were wrong. It’s neat to know what things mean. But most of the time, I don’t have to use it.”

      6. Audience on the show         Actress Mayim Bialik mentioned in an interview that              school where the major      cacters work is based on the California Institute of Technology             (Caltech). As a matter of fact, real-life Caltech students and staff are often in attendance                   when the cast and crew films the show.

7.     7. The Big Bang Theory: The guys will bring about the apocalypse

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A bit dark, but Cracked have posed the idea that The Big Bang Theory is secretly all about the end of the world, and that Sheldon, Leonard, Raj and Howard are the modern-day equivalents of Einstein and Tesla.However, due to living in 2016 and getting obsessed with girls and TV, they are not concentrating on the bigger picture. They're in the wrong era.The Barenaked Ladies' intro theme goes through history on a particular timeline, culminating with our heroes. The show's name is due to the fact that the big bang is expanding to the point where one day gravity will cause it to have a "big crunch", effectively a universe-reboot where everybody dies, and the guys could have saved us somehow but they're too busy watching TV. That's one way to end a show after 10 years.

          8. #Lenny

           It took only one take for Cuoco and Galecki to film Penny professing her love for Leonard.  "Kaley said to Johnny, 'I don't know about you, but when we started the scene, the cameras    and the live audience all went away and it was just us,' " new  showrunner Steve Molaro recalled, noting that he told both actors the shot was beautiful and   he knew they'd never get anything better.

9. Meaning behind Sheldon’s T-shirts.

            The Green Lantern symbol shirts that Sheldon wears on "The Big Bang Theory" have corresponding emotions in the comic universe: red for rage, blue for hope, indigo for compassion and so on. The symbol on Sheldon's shirt is often a clue to his emotions in that scene.

10. The elevator scenes are filmed on just one floor

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This one you may have guessed, but the three floors of the guys' flat is actually just the same set redecorated each time. This means, if you were to visit the fictional apartment block you'll be disappointed.For the sake of a recurring gag, the actors and crew have to recreate the scene to make each floor different each time, which is surely quite a headache. This is probably why we don't see this comedy tool used as much in recent series.