Attention to the Unseen

Felix Flicker writes: What is the world made of? For centuries, people have believed that matter is constructed from tiny, indivisible parts. Some of the earliest known references come from the Greek philosopher Democritus, who taught that the Universe was composed of atoms the size of dust motes floating in sunlight. Theravada Buddhism developed the concept of kalapas, indivisible bundles of properties fleeting into and out of existence. Alchemy’s description of fundamental ‘corpuscles’, expounded by Isaac Newton and others, derived…

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Science Alert reports: For the first time, physicists have observed that ‘holes’ in light can move faster than the light itself. They’re known as phase singularities or optical vortices, and since the 1970s, scientists have predicted that, just as eddies in a river can move faster than the flowing water around them, so too can whirlpools in a wave of light outrun the light they’re embedded within. This does not break relativity, which states that nothing can travel faster than…

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Philip Ball writes: None of the leading interpretations of quantum theory are very convincing. They ask us to believe, for example, that the world we experience is fundamentally divided from the subatomic realm it’s built from. Or that there is a wild proliferation of parallel universes, or that a mysterious process causes quantumness to spontaneously collapse. This unsatisfying state was a key element of Beyond Weird, my 2018 book on the meaning of quantum mechanics. It’s no wonder experts are…

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Pack-Shot/Shutterstock By Florian Neukart, Leiden University Time feels like the most basic feature of reality. Seconds tick, days pass and everything from planetary motion to human memory seems to unfold along a single, irreversible direction. We are born and we die, in exactly that order. We plan our lives around time, measure it obsessively and experience it as an unbroken flow from past to future. It feels so obvious that time moves forward that questioning it can seem almost pointless….

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Matt von Hippel writes: Tinkering at their desks with the mathematics of quantum space and time, physicists have discovered a puzzling conundrum. The arcane rules of quantum theory and gravity let them imagine many different kinds of universes in precise detail, enabling powerful thought experiments that in recent years have addressed long-standing mysteries swirling around black holes. But when a group of researchers examined a universe intriguingly like our own in 2019, they found a paradox: The theoretical universe seemed…

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Dennis Dieks writes: The world we perceive every day is full of things, objects, which we can distinguish from one another, follow in time, and often grasp and manipulate. This experiential fact so imposes itself on us that it is hard to imagine a world without objects. How could we reach out and make contact with the external world if there were no things to touch and see? It is no wonder, then, that from the very beginning of natural…

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Mario Barbatti writes: The camera zooms in on the person’s arm to reveal the cells, then a cell nucleus. A DNA strand grows on the screen. The camera focuses on a single atom within the strand, dives into a frenetic cloud of rocketing particles, crosses it, and leaves us in oppressive darkness. An initially imperceptible tiny dot grows smoothly, revealing the atomic nucleus. The narrator lectures that the nucleus of an atom is tens of thousands of times smaller than…

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