Chloe Effron/iStock
Chloe Effron/iStock

Why Does My Stomach Rumble When I’m Hungry?

Chloe Effron/iStock
Chloe Effron/iStock

WHY? is our attempt to answer all the questions every little kid asks. Do you have a question? Send it to why@mentalfloss.com.

A gurgling, rumbling stomach doesn’t always mean that you’re hungry. It just means your digestive (die-JES-tiv) system is trying to do its job, moving food through your body and getting the nutrients (NEW-tree-ents) that give you energy and help you grow. As your body absorbs these nutrients and gets rid of food waste, though, your stomach empties out and often seems to get noisier!

Your gastrointestinal (gas-tro-in-TES-tin-uhl) tract plays a big role in moving food through your body. It’s a kind of long tube that runs from your mouth (where the food goes in) to your anus (where the poop comes out). Along the way, the food passes through your stomach. A rumbling tummy means the muscles in your stomach and small intestines are squeezing together to push food, liquids, and gases through your gastrointestinal tract. That rumbling gets a lot louder when your stomach is mostly empty.

When the muscles in your stomach and small intestines are pushing everything along after a big meal, all the food packed inside muffles the sound. But if it’s been a while since you’ve eaten, most of that food is gone. Instead, your stomach and intestines contain mostly air and only a little liquid and food. So when the muscles of the stomach and small intestines squeeze, those gurgling gases and liquids inside your empty stomach are easier to hear. 

Watch this D News video of a doctor using a plastic bag, a tube, and some water to demonstrate (or show) how an empty stomach makes noise.  

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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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