The newcomers hugged and high-fived as they joined the three crew on board the space station, where they will replace four colleagues who returned to Earth early in NASA's first medical evacuation in 65 years.
Scientists believe emissions harm human health from air pollution and extreme weather, so ditching the legal basis for environmental protections entirely means none of the rules governing environmental clean-up is safe.
Mrinank Sharma, a researcher at leading AI company Anthropic, posted a resignation statement to social media in which he warned that "the world is in peril".
Adam Mosseri was testifying in a landmark LA trial - where social media giants are accused of causing harm - brought by a woman who spent 16 hours day on his app.
More than a decade after researchers showed deliberate movement could be restored to people with paralysis, devices are now going into the first clinical trials.
More than half of girls have seen online ads for filler and Botox and 41% of 13- to 17-year-olds have seen promotions for prescription-only weight loss drugs, a new report has found.