Why is a mathematician studying fungus?

While the cells in our bodies each hold a single nucleus, in fungus, millions of nuclei move side-by-side in a series of interconnected passageways. Under a microscope, these passageways bear a striking resemblance to cars on a highway, each nucleus-vehicle responsible for distinct tasks – a phenomenon scientists are still working to understand. Fungal Freeways is a brief dive into the Myco-Fluidics Laboratory at the University of California, Los Angeles, where Marcus Roper, assistant professor of mathematics, and his team are working at the intersection of biology and mathematics to crack fungi’s secret solutions to complex organisational problems.

Trawling for secrets in haunting films recovered from the bottom of the sea

The British ocean liner RMS Lusitania embarked on its infamous final voyage from New York to Liverpool on 1 May 1915. Six days later, torpedoed by German U-boats off the southern coast of Ireland, the ship sank in less than 20 minutes, killing 1,198 passengers and crew, and setting the US on the path to join the fight against Germany in the First World War. One of the most luxurious ocean liners of its time, the Lusitania was equipped with what was then a novelty – an onboard movie theatre.

In Sunken Films, the US artist and filmmaker Bill Morrison uses archival footage to unspool the stories of the sinking of this luxury liner, its incendiary movie reels, as well as other films about or from shipwrecks. One early clip was salvaged from the sunken Lusitania in a 1982 expedition; another mysterious film, featuring the Russian revolutionary Vladimir Lenin in 1919-20 with his cat, was recovered from a fishing net off the Danish coast in 1976. By trawling for memories in deep-sea shipwrecks, Morrison offers haunting glimpses into early-20th century film and world history.

Is a red apple proof that all ravens are black? A paradox of scientific logic

Can we learn anything about what makes a raven by looking only at apples? The German-born logician Carl Gustav Hempel (1905-97) thought that, using the inductive logic that scientists rely on to prove or disprove hypotheses, you ought to be able to – but in such a way that clashes mightily with human intuition. This peculiar ripple in reasoning, which became known as ‘the raven paradox’ due to the example Hempel used to elucidate it, goes as follows:

1. All ravens are black
2. If something is not black it is not a raven
3. The fact that my pet raven is black supports the hypothesis that all ravens are black
4. The fact that my apple is red also supports the hypothesis that all ravens are black

The sequence appears to break down somewhere between the third and fourth claims. And yet, upon examination, inductive logic tells us that claim four does indeed follow. In this brief animation, Marc Lange, a professor of philosophy at the University of North Carolina at Chapel Hill, dissects why Hempel’s claim seems to hold to reason, even as it cuts against our intuitions in a way that seems unresolvable.

Lockdown is a way of life for the US asylum-seekers living in churches

While much of the world was adjusting to lockdown and socialising via screens, life went on more or less the same for Vicky Chavez and her two young daughters. For more than two years, they have been unable to leave the First Unitarian Church of Salt Lake City in Utah, their makeshift home. After Chavez was ordered to deport to her native Honduras, which she fled to escape an abusive relationship, the church provided her refuge from US Immigration and Customs Enforcement (ICE) – which doesn’t pursue raids at places of worship – while her case is being fought in court. In her moving short Shelter in Place, the US director Kelsie Moore captures the family’s precarious life in limbo, which includes Chavez’s regular video calls with other asylum-seekers living in churches around the country.

Anil Seth on why our senses are fine-tuned for utility, not for ‘reality’

It’s easy to mistake our conscious experience for an ongoing, accurate account of reality. After all, the information we recover from our senses is, of course, the only window we’ll ever have into the outside world. And for most people most of the time, our perception certainly feels real. But the notion that our senses capture an objective external reality can be dispelled by considering something as fundamental as colour, which can be culturally influenced and, even within a single culture, leave the population split between seeing the same picture of a dress as black-and-blue or white-and-gold.

In this instalment from Aeon’s In Sight series, Anil Seth, professor of cognitive and computational neuroscience at the University of Sussex in the UK, puts our imperfect relationship with reality in perspective. In conversation with Nigel Warburton, consultant senior editor at Aeon+Psyche, Seth argues that it’s not just that our perceptions provide flawed accounts of the outside world, but that our brains aren’t in the business of recovering the outside world to begin with. So it’s more accurate to think of our conscious experience as a series of predictions that we’re incessantly and subconsciously fine-tuning – a world we build from the inside out, rather than the outside in.

For more from Anil Seth, read his Aeon essay on the ‘hard problem’ of consciousness.