To restore tropical forests at scale requires cost-effective methods. An estimated 215 million hectares — an area larger than that of Mexico — have potential for natural forest regeneration, which could lead to an estimated above-ground sequestration of 23.4 gigatonnes of carbon over 30 years.

Brain-wide association studies, which aim to link features of the brain to a person’s characteristics, have a replicability problem. Besides increasing sample size, what else can be done to make these studies more reproducible?

At the interface between Asia and Europe, the Caucasus region was a melting pot during the Bronze Age and the origin of the earliest steppe pastoralist societies. Ancient-DNA analyses reveal how Neolithic ways of life spread through diverse populations and how mountain–steppe interactions transformed the genetic and cultural landscapes of Eurasia.

By patterning an ultrathin layered structure with tiny wells, physicists have created and imaged peculiar states known as quantum scars — revealing behaviour that could be used to boost the performance of electronic devices.