By sailing around the world, the Vendée Globe sailors are highlighting the fragility of our oceans faced with global warming. They are direct witnesses to the changes underway, particularly around ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.

Where no observation is available within the last 75 minutes, the latest observation is shown in italics and coloured and removed from the table after 30 hours. Station names link to data for the ...