Volume 600 Issue 7890



A look back at 2021 through the Sustainable Development Goals.

doi: 10.1038/d41586-021-03781-z



As cases spread and countries plan their response, researchers await crucial data on the severity of the disease caused by the coronavirus variant.

doi: 10.1038/d41586-021-03794-8


London School of Hygiene & Tropical Medicine has pledged to revise equity and diversity policies after a review highlighted racial inequality among students and staff.

doi: 10.1038/d41586-021-03755-1


Researchers are rapidly sequencing the genomes of virus samples worldwide, but shortcomings in the global surveillance system make the task a challenge.

doi: 10.1038/d41586-021-03698-7


The extraordinary vaccination of more than four billion people, and the lack of access for many others, were major forces this year — while Omicron’s arrival complicated things further.

doi: 10.1038/d41586-021-03686-x


A helicopter on Mars, human–monkey embryos, volcanic ash and more.

doi: 10.1038/d41586-021-03521-3

News Features


doi: 10.1038/d41586-021-03621-0

News & Views


Standard quantum theory contains square roots of negative numbers. But how essential are these ‘imaginary’ numbers? A way of disproving analogous theories that omit them has been proposed — and confirmed experimentally.

doi: 10.1038/d41586-021-03678-x


Harnessing immune cells to target tumours is a growing trend. The results of a clinical trial combining such treatment with other standard therapies for gastric cancer have altered medical practice — and more changes are to come.

doi: 10.1038/d41586-021-03458-7


An optical device designed to control the properties of electron waves inside an electron microscope demonstrates that clever platforms for integrated photonics need not be powered by expensive laser systems.

doi: 10.1038/d41586-021-03767-x


Research has uncovered factors that underlie the weight gain associated with cessation of smoking. Here, scientists consider the implications of this finding from the perspectives of gut biology and of smoking.

doi: 10.1038/d41586-021-03548-6


The inclusion of nitrogen atoms stabilizes the zigzag edges of carbon-based nanoribbons, enabling the ribbons to be decoupled from a substrate and providing a probe for their unconventional magnetism.

doi: 10.1038/d41586-021-03768-w


Increasing the sample size of a survey is often thought to increase the accuracy of the results. However, an analysis of big surveys on the uptake of COVID-19 vaccines shows that larger sample sizes do not protect against bias.

doi: 10.1038/d41586-021-03604-1


Highlights from News & Views published this year.

doi: 10.1038/d41586-021-03730-w