How quantum superposition could unravel the ‘grandfather paradox’

The ‘grandfather paradox’ has long been one of the most popular thought experiments in physics: you travel back in time and murder your grandfather before he’s ever born. If you’ve killed your grandfather, you’ve prevented your own existence, but if you never existed, how could you have committed the murder in the first place? Some physicists have avoided the question by arguing that backwards time travel simply isn’t consistent with the laws of physics, or by asserting a ‘many worlds’ interpretation of the Universe. But could the concept of quantum superposition remove what seems so paradoxical from this tale of time travel and murder once and for all?

Delicious? Gross? The great fish dish that divides – and unites – families on Passover

Celebrated annually in early spring, Passover commemorates the Jewish people’s liberation from slavery in ancient Egypt as described in the Book of Exodus. The holiday is generally marked by a large gathering of family and friends known as a Seder, and includes a reading of the Haggadah, a text that recounts the exodus from Egypt, and provides a guide to the traditional Passover meal, which includes matzoh (unleavened bread) and bitter herbs. This short documentary from the US director Rachel Fleit focuses on the tradition as celebrated by the Hermelin family of Detroit, in particular their relationship with a Passover dinner staple – gefilte fish. Though it plays no part in the Exodus story (it originated with Ashkenazi Jewish communities in eastern Europe), this dish of ground whitefish – with a flavour ranging from savoury to sweet, depending on the recipe – is nonetheless the most discussed culinary offering at the table. But despite its deeply polarising taste and texture, the annual gefilte fish is embraced by generations of Hermelins as a symbol of cultural tradition and familial bonds, imbued with ‘the joy of Judaism’.

Deep time and beyond: the great nothingness at the end of the Universe

‘The Universe becomes a cosmic boneyard, strewn with remnants of dead stars.’

This is the way the Universe ends, not with a bang, but with an unfathomably profound and gradual chill. Or, at least that’s one guess held by many scientists – but we don’t really know, and it’s entirely possible that we never will. This video from the US filmmaker and musician John Boswell starts in 2019 and plays out one theory of how everything – truly everything – will end. With the speed of the passage of time doubling every five seconds, inventive visual interpretations of cosmological phenomena, and narrated by science luminaries such as Stephen Hawking, Martin Rees and Janna Levin, the video guides us deep into a possible evolution of the Universe. Impressively translating theoretical physics and astronomically vast scales of time and space into 29 breathtaking minutes, Timelapse of the Future takes us all the way into the sublime of the unimaginable, with all the wonder and terror that might provoke.

Via Kottke

When does US news ignore a terror plot? When the target is called Islamberg

Islamberg is a small hamlet of roughly two dozen families in upstate New York that has come to represent some of the most pernicious contradictions of political culture in the United States. Situated 130 miles north of New York City on the Pennsylvania border, the town was formed in the early 1980s by members of an African-American Muslim community in Brooklyn looking to escape the fraught conditions in the city at the time, including the crack epidemic. As such, Islamberg is an almost archetypal example of those ostensibly ‘American’ ideals of religious freedom and the pursuit of a better life. Since its founding, however, the community has contended with rumours of connections to radical Islamic terrorism despite repeated assurances from local law-enforcement that no such threat exists. On the contrary, the rumours have put the community itself in danger.

The US director David Felix Sutcliffe’s film White Fright explores Islamberg in the context of a foiled 2015 attack on the community, which was planned by a white Christian minister and ultimately intercepted by the FBI. Splicing together FBI documents, news footage and interviews with Islamberg residents, the documentary probes how deceptive and inflammatory Right-wing news coverage helped to inspire the plan for a massacre at a mosque and school in the town, while other national news outlets barely covered the plot upon its unravelling. Since the film’s release in 2018, Islamberg was subject to yet another plot to murder its residents that was foiled by law enforcement in January 2019.

From ‘The Second Sex’ to ‘Gender Trouble’ – Butler’s hat tip to de Beauvoir

The American philosopher Judith Butler is one of the preeminent contemporary thinkers on issues at the intersection of gender and identity. A professor at the University of California, Berkeley and at the European Graduate School, she’s perhaps best-known for her book Gender Trouble (1990), which argues that gender, sex and sexuality are continuous and highly mutable cultural performances, and not predetermined by human biology. This brisk and energetic video from the French filmmaker Géraldine Charpentier-Basille animates cutouts of diverse human forms to accompany an extract from a 2006 interview with Butler in which she cites Simone de Beauvoir’s The Second Sex (1949) as inspiration. Although brief, the piece is an excellent conversation-starter on the question of what ‘becoming’ might mean, both in the context of gender and more broadly in the pursuit of the ‘authentic’ self. It’s also a pleasing reminder of the many ways that ideas spread and transmute over time.