The wily and merciless veined octopus stalks an unsuspecting rock crab

Known for assembling sea scraps into impromptu forts used for stalking prey, the veined octopus is one of the most cunning predators in the Pacific Ocean’s tropical waters. Setting the tone with a pulsing, ominous score, Jose Lachat’s short nature video features a veined octopus taking cover in a clam shell in a quiet and calculating search for its next meal.

If simple logic isn’t working with your internet company, try Zermelo-Fraenkel set theory

This tongue-in-cheek animation from the US YouTuber Henry Reich – the mind behind MinutePhysics – is a creative exercise in how not to lose your cool when faced with the abyss of illogic. Recalling the mundane, mindnumbing tribulations of trying to get a straight answer on billing from his internet service provider (ISP), Reich concludes that the company isn’t just guilty of subpar customer service – their policies also break nearly every fundamental law of modern mathematics. Reich’s clever excoriation of telecommunication companies was created for The Festival of Bad Ad Hoc Hypotheses (BAHFest), an annual ‘celebration of well-argued and thoroughly researched but completely incorrect scientific theories’.

Mind control and zombification do exist. Just look at these crickets

Warning: this video is not for the squeamish.

Mayflies make a quick and nutritious snack for crickets. But, rather unfortunately for the cricket population of California, some mayflies are home to hairworms (nematomorphs) – parasitic creatures that will stop at nothing to make their way back to water. Once consumed, hairworms feed off crickets from the inside, absorbing all of their lipids, and eventually putting the cricket in a state of developmental and reproductive limbo. Worse still, once these fast-growing parasites reach their adult length of one to two feet, they zombify their hosts, unleashing brain chemicals that make the infected crickets wander aimlessly until they hit water, where the worms make their final escape and start the whole cycle anew. By studying this process, scientists hope to learn more about how brain parasites might affect human behaviour. The ordeal is captured in microscopic detail in this episode of the often creepy, always fascinating science documentary series Deep Look. Read more about the video at KQED Science.

Human capital: art, exercise and industry in the streets of Beijing

As preparations for the 2008 Summer Olympics were transforming swathes of Beijing, the Portuguese filmmaker Sérgio Cruz was exploring the city’s streets and public spaces with his camera. Taking an observational approach, Cruz found a metropolis undergoing rapid development, while in pockets its distinctive traditions and pastimes continued unabated. Amid cacophonous construction and air pollution heavy on the skyline, there’s a rich and unceasing pulse of communal life – what Cruz calls ‘a 24-hour live show full of music, dance and sports’. A choir gathers to sing in an underground tunnel; a group practises synchronised tai chi under a basketball hoop in a park; couples dance in a public square at dusk. While deliberately paced, Cruz’s short film is not unlike the curious tourist who breaks away from the planned itinerary to seek out excitement and small surprises around every new corner.

Music was ubiquitous in Ancient Greece. Now we can hear how it actually sounded

Much of what we think of as Ancient Greek poetry, including Homer’s Iliad and Odyssey, was composed to be sung, frequently with the accompaniment of musical instruments. And while the Greeks left modern classicists many indications that music was omnipresent in society – from vases decorated with lyres, to melodic notation preserved on stone – the precise character and contours of the music has long been considered irreproducible. However, the UK classicist and classical musician Armand D’Angour has spent years endeavouring to stitch the mysterious sounds of Ancient Greek music back together from large and small hints left behind. In 2017, his work culminated in a unique performance at the Ashmolean Museum in Oxford, intended to recreate the sounds of Greek music dating as far back as Homer’s era – roughly 700 BCE. This short documentary details the extraordinary research and musical expertise that made the concert possible, revealing remarkable sounds once thought lost to time. To learn more about what music sounded like in Ancient Greece, read D’Angour’s Aeon idea.

Via Open Culture