Nature News
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![[:es]How did Neanderthals and other ancient humans learn to count?[:]](https://katedra.eus/app/uploads/2021/06/d41586-021-01429-6_19199268.jpg)
[:es]How did Neanderthals and other ancient humans learn to count?[:]
Archaeological finds suggest that people developed numbers tens of thousands of years ago. Scholars are now exploring the first detailed hypotheses about this life-changing invention.
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![[:es]Hundreds of gibberish papers still lurk in the scientific literature[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01436-7_19199216.jpg)
[:es]Hundreds of gibberish papers still lurk in the scientific literature[:]
The nonsensical computer-generated articles, spotted years after the problem was first seen, could lead to a wave of retractions.
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![[:es]Limit on lab-grown human embryos dropped by stem-cell body[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01423-y_19198484.jpg)
[:es]Limit on lab-grown human embryos dropped by stem-cell body[:]
The International Society for Stem Cell Research relaxed the famous 14-day rule on culturing human embryos in its latest research guidelines.
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![[:es]Injection of light-sensitive proteins restores blind man’s vision[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01421-0_19189956.jpg)
[:es]Injection of light-sensitive proteins restores blind man’s vision[:]
The first successful clinical test of a technique called optogenetics has allowed a person to see for the first time in decades, with the help of image-enhancing goggles.
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![[:es]The mysterious microbes that gave rise to complex life[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01316-0_19163150.jpg)
[:es]The mysterious microbes that gave rise to complex life[:]
As scientists learn more about enigmatic archaea, they’re finding clues about the evolution of the complex cells that make up people, plants and more.
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![[:es]First nuclear detonation created ‘impossible’ quasicrystals[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01332-0_19168492.jpg)
[:es]First nuclear detonation created ‘impossible’ quasicrystals[:]
Their structures were once controversial. Now researchers have discovered quasicrystals in the aftermath of a 1945 bomb test.
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![[:es]The myriad ways sewage surveillance is helping fight COVID around the world[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01234-1_19142282.jpg)
[:es]The myriad ways sewage surveillance is helping fight COVID around the world[:]
Wastewater tracking was used before the pandemic to monitor for polio and illicit drug use, but interest in the field and its applications has now ballooned.
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![[:es]How COVID broke the evidence pipeline[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01246-x_19143564.jpg)
[:es]How COVID broke the evidence pipeline[:]
The pandemic stress-tested the way the world produces evidence — and revealed all the flaws.
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![[:es]How many COVID deaths are acceptable in a post-pandemic world?[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01220-7_19134842.jpg)
[:es]How many COVID deaths are acceptable in a post-pandemic world?[:]
Even after mass vaccinations, some hospitalizations and deaths from the coronavirus are inevitable — but opinions differ on how many is too many for a return to relative normality.