Nature News
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![[:es]Why do COVID death rates seem to be falling?[:]](https://katedra.eus/app/uploads/2020/11/d41586-020-03132-4_18560476.jpg)
[:es]Why do COVID death rates seem to be falling?[:]
Hard-won experience, changing demographics and reduced strain on hospitals are all possibilities — but no one knows how long the change will last.
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![[:es]UAE ramps up space ambitions with Arab world’s first Moon mission[:]](https://katedra.eus/app/uploads/2020/11/d41586-020-03054-1_18544736.jpg)
[:es]UAE ramps up space ambitions with Arab world’s first Moon mission[:]
With its orbiter Hope on its way to Mars, the United Arab Emirates has now set its sights on the Moon.
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![[:es]Are infections seeding some cases of Alzheimer’s disease?[:]](https://katedra.eus/app/uploads/2020/11/d41586-020-03084-9_18549230.jpg)
[:es]Are infections seeding some cases of Alzheimer’s disease?[:]
A fringe theory links microbes in the brain with the onset of dementia. Now, researchers are taking it seriously.
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![[:es]Melt mapped inside Earth’s mantle[:]](https://katedra.eus/app/uploads/2020/11/d41586-020-02925-x_18497760.png)
[:es]Melt mapped inside Earth’s mantle[:]
An analysis of seismic data reveals the location and quantity of melted rock, known as melt, in Earth’s upper mantle. The results show how these factors are correlated with the […]
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![[:es]Why schools probably aren’t COVID hotspots[:]](https://katedra.eus/app/uploads/2020/10/d41586-020-02973-3_18510162.jpg)
[:es]Why schools probably aren’t COVID hotspots[:]
Young children are unlikely to spread the virus — but older kids are more at risk, say researchers.
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![[:es]These bizarre ancient species are rewriting animal evolution[:]](https://katedra.eus/app/uploads/2020/10/d41586-020-02985-z_18511484.jpg)
[:es]These bizarre ancient species are rewriting animal evolution[:]
Early fossils with guts, segmented bodies and other sophisticated features reveal a revolution in animal life — before the Cambrian explosion.
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![[:es]This beetle’s stab-proof exoskeleton makes it almost indestructible[:]](https://katedra.eus/app/uploads/2020/10/d41586-020-02976-0_18497448.jpg)
[:es]This beetle’s stab-proof exoskeleton makes it almost indestructible[:]
Jigsaw-puzzle-shaped seams that hold a notoriously tough insect’s wing cases together could inspire engineers.
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![[:es]Universal assembly instructions for the placenta[:]](https://katedra.eus/app/uploads/2020/10/d41586-020-02914-0_18487092.png)
[:es]Universal assembly instructions for the placenta[:]
Our understanding of how mammalian embryos develop is based largely on mice. A study now reveals striking similarities and intriguing differences between mouse, cow and human embryos.
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![[:es]Face masks: what the data say[:]](https://katedra.eus/app/uploads/2020/10/d41586-020-02801-8_18428360.jpg)
[:es]Face masks: what the data say[:]
The science supports that face coverings save lives, and yet the debate trundles on. How much evidence is enough?