5 October 2022
Chicago 12, Melborne City, USA
Sience

A Wheel Made of ‘Odd Matter’ Spontaneously Rolls Uphill

In a physics lab in Amsterdam, there’s a wheel that can spontaneously roll uphill by wiggling. This “odd wheel” looks simple: just six small motors linked together by plastic arms and rubber bands to form a ring about 6 inches in diameter. When the motors are powered on, it starts writhing, executing complicated squashing and […]

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Sience

The Physics of Going Fast—but Not Too Fast—on a Giant Slide

Really, the only difference is that this is a downward-curving path with the center of this circular curve below the slide instead of above. (Once again, the gray C-shape represents the path of the rider on the slide and the circular trajectory of their body, and the dot is the center of the circle.) That […]

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Sience

Engine based on Maxwell’s demon concept may help us understand entropy

Researchers have built an engine based on a famous thought experiment called Maxwell’s demon, and it may help us understand how entropy is produced Physics 20 September 2022 By Leah Crane A canister of shaking beads mimics the Maxwell’s demon thought experiment Antoine Naert/ENS de Lyon A device based on a 155-year-old thought experiment has […]

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Sience

With ‘What If? 2’, Randall Munroe Is Back to Answer Your Impossible Questions

I was first just reading about how MRIs have got really big magnets in them, and thinking: I know that the magnetic field extends out away from them. It can’t extend out forever, because when I drop my keys, they don’t go flying off to the nearest MRI. So the first question is: How far […]

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Sience

Forget Silicon. This Computer Is Made of Fabric

Dan Preston logs in to our video call in a respectable, nondescript button-up shirt. His personal style may lean toward the conventional, but the Rice University mechanical engineer is here to tell me about his creative new fashion design. His team has made a shiny black jacket that performs logic—without electronics. Specifically, the jacket can […]

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Sience

Could Climate Change Alter the Length of the Day?

Let’s consider an example with an imaginary planet. In this solar system, the planet completes one orbit around its sun in 8.6 solar days, instead of 365 days, as the Earth does. (I’m using a shorter year because it magnifies the difference between solar and stellar days, so you can see it more easily.) Here […]

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Sience

Where Do High-Energy Cosmic Rays Come From? A Star’s Last Gasp

Gamma rays from this supernova remnant have been seen by telescopes since 2007, but exceptionally energetic light wasn’t detected until 2020, when it was picked up by the HAWC Observatory in Mexico, piquing the interest of scientists hunting for galactic PeVatrons. When gamma rays reach our atmosphere, they can produce showers of charged particles that […]

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Sience

At Long Last, Mathematical Proof That Black Holes Are Stable

In 1963, the mathematician Roy Kerr found a solution to Einstein’s equations that precisely described the spacetime outside what we now call a rotating black hole. (The term wouldn’t be coined for a few more years.) In the nearly six decades since his achievement, researchers have tried to show that these so-called Kerr black holes […]

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Sience

Particle Physicists Puzzle Over a New Duality

Once found, these inscrutable rules have helped particle physicists calculate scattering amplitudes at much higher levels of precision than they could achieve with the traditional approach. The restructuring also allowed Dixon and his collaborators to spot the hidden connection between the two seemingly unrelated scattering amplitudes. Antipode Map At the heart of the duality is […]

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Sience

What an iPhone Lidar Can Show About the Speed of Light

But since this uses the total time of flight for the ball, it gives the total distance the ball traveled—to the wall and back. If you take that distance and divide by 2, you get the distance from my hand to the wall, which in this case would be 10 meters. I like this BallDAR […]

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