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A "negative greenhouse effect" means rising concentrations of CO2 and methane have slightly cooled parts of Antarctica’s upper atmosphere, but that could change as the air becomes more humid

A "negative greenhouse effect" means rising concentrations of CO2 and methane have slightly cooled parts of Antarctica’s upper atmosphere, but that could change as the air becomes more humid

A tiny robot with a clutch that mimics similar mechanisms found in microorganisms could be used to trigger the internal workings of a cell

Incredibly thin, hollow wires made from gallium and nitrogen can produce laser beams that are hollow with a ring-shaped cross-section, and that could be used to create optical fibres out of thin air

US officials have warned of a new international security threat – a mysterious Russian space weapon that may possess nuclear capabilities. Here’s what you need to know

Tree-planting projects in Africa may damage grasslands and savannahs by introducing too much shade. By preventing smaller plants from photosynthesising, this would have knock-on effects for the rest of the ecosystem

The largest study of telehealth abortions to date has found that the medications are just as safe and effective if they are obtained via online services instead of through a face-to-face doctor’s appointment

Changing the microbial community on the roots of tea plants can improve the flavour and nutritional content of the leaves, leading to a better-tasting cuppa

Rethinking a century-old chemical reaction could jump-start the production of cleaner jet fuel made from captured carbon dioxide and clean electricity

As organic material in a bone gets replaced by minerals over time, it becomes a fossil. But that can happen at different rates even within the same individual

A measure of consciousness called neural complexity increases even with small doses of LSD, but we still don't know the potential risks of microdosing psychedelic drugs

Different species of poison frogs tap their toes when feeding to create vibrations that cause flies to move closer to them

Children who live in countries where school uniforms are the norm appear to be less active than those who don't, possibly because the clothing restricts their movement

A drug called pazopanib is known to provide brief relief from arthritis pain – encapsulating it in nanoparticles can make its effects last much longer, research in mice suggests

A 2200-year-old burial ground in northern Italy includes people interred with dogs and horses, perhaps showing they had strong bonds with their animals

An emoji that represents happiness to one person may signify a different emotion to another, with this varying according to our age, gender and nationality

Sperm that were immobile became active after just 20 seconds of ultrasound exposure in a lab experiment that may help boost the success of fertility treatment

Tom Gauld's weekly cartoon

This week's cartoon from Twisteddoodles

Feedback investigates research into US voters (and their handedness) between 1964 and 2016, and discovers that conclusions of some sort have been drawn