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Are we living in a simulation? This experiment could tell us

Physics

Are we living in a simulation? This experiment could tell us

The idea that we might be living in a simulated reality has worried us for centuries. Now physicists have found some tantalising clues – and devised an experiment that might reveal the truth

Features

Health

Long covid may be making your periods longer and heavier

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Health

Covid-19 seems to age blood vessels – but only among women

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Lung tissue samples from mice, showing the nuceli of cells (blue), cancerous cells (green) and markers of proliferation (magenta)

Health

Covid-19 and flu may reawaken dormant cancer cells in the lungs

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The pandemic may have aged our brains even before we caught covid-19

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The truth about ivermectin’s supposed health benefits

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US stops endorsing covid-19 shots for kids – are other vaccines next?

Analysis

Transmission electron micrograph of SARS-CoV-2 virus particles (gold) within a nasal cell

Health

Covid smell loss eased by injecting blood cells into the nose

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5 graphs that show how the world suddenly changed when covid-19 hit

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A quarantine control notice at Narita airport in Japan in January 2020

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The key events during the covid-19 pandemic

Many dates stick in our minds as we reflect on five years of living with covid-19 - here are some of the most memorable ones

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Will there be another pandemic after covid-19 and are we prepared?

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Covid-19 led to a new era of vaccines that could transform medicine

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Everything we know about long covid - including how to reduce the risk

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The most iconic images taken during the covid-19 pandemic

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