What if I told you there was a movie just as grounded and believable as Primer, one that doesn't require five viewings and a diagram to understand? 'Timecrimes' is streaming for free online right now.

A young University of Queensland student says he has found a way to "square the numbers" and prove that "paradox-free" time travel is theoretically possible in our universe. From Back To The Future to Terminator to 12 Monkeys, stories dealing with time travel invariably have had to grapple with an age-old head-scratcher.

“Agents could have free choice to make any action they wanted and no paradox would arise because the events just adjust themselves to remain consistent," said study author Germain Tobar.

No one has yet managed to travel through time – at least to our knowledge – but the question of whether or not such a feat would be theoretically possible continues to fascinate scientists.

Astrophysicist Ron Mallett believes he’s found a way to travel back in time — theoretically. The tenured University of Connecticut physics professor recently told CNN that he’s written a scientific equation that could serve as the foundation for an actual time machine. He’s even built a prototype device to illustrate a key component of his theory — though Mallett’s peers remain unconvinced that his time machine will ever come to fruition.

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The concept of time travel has always captured the imagination of physicists and laypersons alike. But is it really possible? Of course it is. We're doing it right now, aren't we? We are all traveling into the future one second at a time.

It's one of the most common tropes in science fiction. But which movies actually get the science right?

Organisers of Prof Stephen Hawking's memorial service have seemingly left the door open for time travellers to attend. Those wishing to honour the theoretical physicist, who died in March aged 76, can apply via a public ballot. Applicants need to give their birth date - which can be any day up to 31 December 2038. Prof Hawking's foundation said the possibility of time travel had not been disproven and could not be excluded.

Time travel as we see it in movies—using DeLoreans, phone booths, hot tubs, and the like—obviously doesn’t exist. But throughout history, people have insisted that they somehow managed to do it. Though most of their wild tales were eventually disproven, the stories are still incredible. Here are five of the most memorable.

There are rules of the physical world that don’t apply to the mental world... By Tara MacIsaac.

Scientists from the University of Queensland, Australia, have used single particles of light (photons) to simulate quantum particles travelling through time. They showed that one photon can pass through a wormhole and then interact with its older self. Their findings were published in Nature Communications.

Albert Einstein's theory of general relativity suggests backward time travel is possible in some scenarios, but do those situations ever exist in our universe?

The proposed method relies on the invention of a material known as ‘exotic matter.’ By Abigail Beall.

Nearly seven in ten Republicans prefer America as it was in the 1950s, a nostalgia of course entirely unavailable to a person like me, for in that period I could not vote, marry my husband, have my children, work in the university I work in, or live in my neighborhood. Time travel is a discretionary art: a pleasure trip for some and a horror story for others. By Zadie Smith.

The concept is a lot newer than most people realize. By Maria Konnikova.

‘New York Times’ Thomas Friedman graphed history in his new book, ‘Thank You For Being Late’ – outdo him and win a free T-shirt! By Matt Taibbi.

It’s 2016, meaning we now have many examples of Trek’s time paradoxes to explore. By Xaq Rzetelny.

We have grown very used to the idea of time travel, as explored and exploited in so many movies and TV series and so much fiction. Although it feels like it’s been around forever, it isn’t an ancient archetypal story but a newborn myth, created by H.G. Wells in his 1895 novel The Time Machine. By John Lanchester.

Births, deaths, and other time travel paradoxes. By James Gleick.