The plodding photon, or how the speed of light looks sluggish on a galactic scale

According to Albert Einstein’s theory of special relativity, the speed of light (approximately 299,792 kilometres – or roughly 7.5 rotations around the Earth – per second in a vacuum) is the Universe’s speed limit, and therefore the fastest we could ever hope to travel through space. Swift as it might seem, when it comes to traversing the vast expanses between solar systems and galaxies, it’s still very slow-going. Indeed, the nearest galaxy to the Milky Way, Canis Major, is 25,000 light years away. Set to a mesmerising score by the US composer Steve Reich, Riding Light is an illuminating look at light speed, simulating the journey of a photon from the Sun’s surface to just beyond Jupiter’s orbit. For a brisker take, see a condensed, three-minute version of the same video here.

Basic healthcare and clean needles is all in a day’s work at a roving addiction clinic

Marc Lasher works as an addiction medicine specialist but, between his regular appointments, he oversees a clean-needle exchange on the streets of Fresno County in California, out the back of a modified school bus. Lasher’s decades-long dedication to public health is all the more impressive considering that his programme was illegal in the state until 2012. In the wake of the opioid epidemic, his approach – addressing drug addiction as a matter of public health rather than criminality – has only recently come into favour in much of the United States. In this acclaimed documentary, the US filmmaker Elivia Shaw follows Lasher and a team of young volunteers as they provide people coping with addiction with clean needles, as well as basic medical care and referrals to specialists and detox centres. The result is both a moving testament to Lasher and his team’s selfless work and a damning indictment of a healthcare system in which unaddressed health issues, costs and the physical and emotional tolls of poverty compound each other relentlessly.

Jim Hall, 78, has a blue body – but his outlook on life is more unusual still

‘I decided it was OK to have fun with my body … I probably have more balls than anybody!’

Jim Hall worked in urban development for four decades before retiring as the principal city planner of Baltimore. Aged 78 and beginning to feel some of his faculties slip, he is planning a move to Texas to live out his final years. These unremarkable details of his biography might seem at odds with his unique look – most conspicuously, the blue tattoo covering almost every inch of his skin. But despite the unusual choices he’s made to modify his body – including some unusual, intimate augmentations hidden from view – Hall’s outlook on life is deeply practical, centred on playfulness and an enduring sense of gratitude for what he sees as the incredible gift of being a human. With a palette that complements Hall’s own chosen colours, this short documentary from the US directors Jonathan Bregel and Steve Hoover finds wonder and wisdom in a man who is as hard to define as he is plain-spoken and pragmatic.

What’s it like to chat with an AI that mimics you? Uncanny conversations with Replika

Replika is a chatbot that was launched in 2017 with the aim of offering users emotional support – or, as the company’s advertising copy puts it, becoming their ‘AI friend’. To give users a personalised experience, the deep learning bot gathers information about conversation partners by asking them questions, adapts to their conversational style and, over time, attempts to mimic them. Beyond companionship, Replika’s creators believe that the technology could eventually serve as a conversational stand-in for deceased loves ones.

In Soft Awareness, Anastasia Sif Karkazis, a Danish film student and co-director of the film, engages in a series of conversations with Replika, drifting between a series of loosely connected subjects – including art, dreams and identity. Throughout, the exchanges seem to teeter between meaningful and unintelligible, offering a window on Karkazis’s inner world, how Replika ‘understands’ her, and the many hazy areas in between. Beneath the surface of these uncanny exchanges, larger questions about privacy and the contours of intimacy between humans and AI slowly emerge.

Via Labocine

Postcards from Vladimirskoye – the sleepy town near the ‘Russian Atlantis’

According to Russian legend, in the 13th century, the mythical city of Kitezh was on the verge of being ransacked by Mongols when its residents began to pray. In an instant, water spouted from the earth, at once submerging the city and protecting Kitezh from invaders. Today, in the Nizhny Novgorod region, Lake Svetloyar – the body of water that Kitezh supposedly sunk into – is a tourist destination for both the faithful and those simply wishing to enjoy its beaches. The flow of visitors, however, barely touches the small town of Vladimirskoye just a kilometre away. In Kitezh-Vladimirskoe, the Dutch photographer and filmmaker Pieter Ten Hoopen depicts town life in a series of intertwining tableaux – baptisms, kids on their bikes, old men shouting from windows – all suffused with a comically incongruent soundtrack. It’s an offbeat, charming portrait of a place, like a series of moving postcards from an ordinary town off the tourist track.