The Atlantic
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No One Actually Knows What a Moon Is
The universe has quasi-moons, mini-moons, and moonlets, but no official definition of what counts as a moon.
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Tattoos Do Odd Things to the Immune System
When you stick ink-filled needles into your skin, your body’s defenders respond accordingly. Scientists aren’t sure if that’s good or bad for you.
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![[:es]Polio Is Exploiting a Very Human Weakness[:]](https://katedra.eus/app/uploads/2021/09/png-1-11.png)
[:es]Polio Is Exploiting a Very Human Weakness[:]
[:es]The world has been so close to eradicating polio for so long—which is exactly why the virus is staging a comeback now.[:]
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![[:es]Man’s Other Best Friend[:]](https://katedra.eus/app/uploads/2023/10/png-6.png)
[:es]Man’s Other Best Friend[:]
[:es]Domesticating horses changed humanity forever. Where and when did it first happen?[:]
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![[:es]What Humans Can Learn From Nature’s Biggest Hibernators[:]](https://katedra.eus/app/uploads/2023/10/png-3.png)
[:es]What Humans Can Learn From Nature’s Biggest Hibernators[:]
[:es]Could bears hold the key to better treatments for stroke, osteoporosis, and Alzheimer’s?[:]
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![[:es]Do birds have language? It depends on how you define it.[:]](https://katedra.eus/app/uploads/2022/03/media_birdsong-language-1600x600-1.jpg)
[:es]Do birds have language? It depends on how you define it.[:]
[:es] In the cheeps, trills and tweets of birdsong, scientists find some parallels with human speech [:]

![[:es]A Gnarly New Theory About Saturn’s Rings[:]](https://katedra.eus/app/uploads/2022/06/png-3-15.png)
![[:es]We Almost Forgot About the Moon Trees[:]](https://katedra.eus/app/uploads/2023/10/png-1.png)