According to Dr Emmett Brown, it’s what makes time travel possible, although not without the considerable boost of 1.21 gigawatts of power.

“But”, I hear you ask, “how does the flux capacitor work?” Well, wonder no longer. Sloshspot.com have worked it all out and given us this handy guide so that we can now see how the flux capacitor achieves time travel.

To be honest, I am no expert in theoretical physics and cannot therefore comment on whether the explanation provided holds up under scrutiny. If we’re lucky, Prof. Brian Cox (the “wonders of the solar system” guy, not General Stryker from X-Men 2) follows HeyUGuys and he’ll have a look at it for us. All I will say is that the explanation that the flux capacitor “converts the positive energy to negative energy” does not sounds entirely convincing.

After this diagram did the rounds on Twitter recently to try to explain Inception, this looks like another fun attempt to bring clarity to the potentially baffling. If you happen to have a PhD in theoretical physics, do let us know what you think.

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Dave has been writing for HeyUGuys since mid-2010 and has found them to be the most intelligent, friendly, erudite and insightful bunch of film fans you could hope to work with. He's gone from ham-fisted attempts at writing the news to interviewing Lawrence Bender, Renny Harlin and Julian Glover, to writing articles about things he loves that people have actually read. He has fairly broad tastes as far as films are concerned, though given the choice he's likely to go for Con Air over Battleship Potemkin most days. He's pretty sure that 2001: A Space Odyssey is the most overrated mess in cinematic history.