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Why a Dripping Faucet Makes That Maddening 'Plink' Sound—and How to Stop It

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iStock

In most cases, calling a professional is the best option when dealing with a stubborn faucet leak. With the right tools and knowledge, the problem isn't that difficult to solve. But when every other thought you have is interrupted by that incessant "plink" noise, even a few hours spent waiting for the plumber can feel like an eternity. A team of scientists recently looked at the mechanics that make that sound so annoying, and they've come up with a quick fix you can use to silence it before tackling the source.

The researchers from the University of Cambridge recently published their findings in the journal Scientific Reports. To get to the bottom of the annoying acoustics, they recorded a leaky faucet using a microphone, a hydrophone, and ultra-high-speed cameras. “A lot of work has been done on the physical mechanics of a dripping tap, but not very much has been done on the sound,” lead researcher Anurag Agarwal said in a press release. “But thanks to modern video and audio technology, we can finally find out exactly where the sound is coming from, which may help us to stop it.”

They found that the unmistakable "plink" comes not from the water droplet itself, but from an air bubble trapped beneath it. When a drop of water hits something, a cavity forms inside it. This cavity immediately recoils, creating a water column that splashes away from the surface that was hit. The cavity recoils so quickly that it leaves a small air bubble beneath the water.

Scientists already knew the physics, but until now it was unclear which part of the equation produces the dripping noise. The University of Cambridge team observed that it's not the impact of the droplet, the creation of the cavity, or the upward splash of water that make the sound: It's the air bubble, which vibrates and pushes sound waves through the air in a way that's uniquely grating to the ears.

The researchers were also able to identify a way to neutralize this effect without any fancy equipment. Just add some liquid soap to the bottom of the sink to change the surface tension of the water each time a droplet splashes. This slight adjustment is enough to stop the air bubble from forming and quiet the sound.

The constant noise keeping you up at all hours of the night isn't the only reason leaky taps are a pain. According to the Environmental Protection Agency, Americans lose 1 trillion gallons of water a year to leaks. Every year, the EPA runs Fix a Leak Week, a campaign aimed at getting homeowners to catch all the wasteful leaks on their property—not just the ones within hearing distance.

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MARS Bioimaging
The World's First Full-Color 3D X-Rays Have Arrived
MARS Bioimaging
MARS Bioimaging

The days of drab black-and-white, 2D X-rays may finally be over. Now, if you want to see what your broken ankle looks like in all its full-color, 3D glory, you can do so thanks to new body-scanning technology. The machine, spotted by BGR, comes courtesy of New Zealand-based manufacturer MARS Bioimaging.

It’s called the MARS large bore spectral scanner, and it uses spectral molecular imaging (SMI) to produce images that are fully colorized and in 3D. While visually appealing, the technology isn’t just about aesthetics—it could help doctors identify issues more accurately and provide better care.

Its pixel detectors, called “Medipix” chips, allow the machine to identify colors and distinguish between materials that look the same on regular CT scans, like calcium, iodine, and gold, Buzzfeed reports. Bone, fat, and water are also differentiated by color, and it can detect details as small as a strand of hair.

“It gives you a lot more information, and that’s very useful for medical imaging. It enables you to do a lot of diagnosis you can’t do otherwise,” Phil Butler, the founder/CEO of MARS Bioimaging and a physicist at the University of Canterbury, says in a video. “When you [have] a black-and-white camera photographing a tree with its leaves, you can’t tell whether the leaves are healthy or not. But if you’ve got a color camera, you can see whether they’re healthy leaves or diseased.”

The images are even more impressive in motion. This rotating image of an ankle shows "lipid-like" materials (like cartilage and skin) in beige, and soft tissue and muscle in red.

The technology took roughly a decade to develop. However, MARS is still working on scaling up production, so it may be some time before the machine is available commercially.

[h/t BGR]

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ESA/Herschel/SPIRE; M. W. L. Smith et al 2017
Look Closely—Every Point of Light in This Image Is a Galaxy
ESA/Herschel/SPIRE; M. W. L. Smith et al 2017
ESA/Herschel/SPIRE; M. W. L. Smith et al 2017

Even if you stare closely at this seemingly grainy image, you might not be able to tell there’s anything to it besides visual noise. But it's not static—it's a sliver of the distant universe, and every little pinprick of light is a galaxy.

As Gizmodo reports, the image was produced by the European Space Agency’s Herschel Space Observatory, a space-based infrared telescope that was launched into orbit in 2009 and was decommissioned in 2013. Created by Herschel’s Spectral and Photometric Imaging Receiver (SPIRE) and Photodetector Array Camera and Spectrometer (PACS), it looks out from our galaxy toward the North Galactic Pole, a point that lies perpendicular to the Milky Way's spiral near the constellation Coma Berenices.

A close-up of a view of distant galaxies taken by the Herschel Space Observatory
ESA/Herschel/SPIRE; M. W. L. Smith et al 2017

Each point of light comes from the heat of dust grains between different stars in a galaxy. These areas of dust gave off this radiation billions of years before reaching Herschel. Around 1000 of those pins of light belong to galaxies in the Coma Cluster (named for Coma Berenices), one of the densest clusters of galaxies in the known universe.

The longer you look at it, the smaller you’ll feel.

[h/t Gizmodo]

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