Nature News
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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[:]
[:es] 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[:]
[:es] 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[:]
[:es] 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[:]
[:es] 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[:]
[:es] 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[:]
[:es] 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?[:]
[:es] 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. […]
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![[:es]Fevers are plaguing the oceans — and climate change is making them worse[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01142-4_19121558.gif)
[:es]Fevers are plaguing the oceans — and climate change is making them worse[:]
[:es] Sudden marine heatwaves can devastate ecosystems, and scientists are scrambling to predict when they will strike. [:]
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![[:es]Weird viral DNA spills secrets to biologists[:]](https://katedra.eus/app/uploads/2021/05/d41586-021-01157-x_19116942.jpg)
[:es]Weird viral DNA spills secrets to biologists[:]
[:es] Bacteria-infecting viruses have specialized enzymes to make genes with alternative nucleobase. [:]