The United Nations Children's Fund says at least 242 million children in 85 countries had their schooling interrupted last year because of heatwaves, cyclones, flooding and other extreme weather.

UNICEF says middle- and low-income countries were the hardest hit. The agency criticized the "overlooked" impact of the climate crisis on education.

Researchers analyzed 168,464 samples to uncover how geographic and technical factors shape global gut microbiome variation, highlighting underrepresented regions and technical biases.