100-year-old colour perception theory had a math mistake: study

This visualization captures the 3D mathematical space used to map human color perception. (Credit: Los Alamos National Laboratory) This visualization captures the 3D mathematical space used to map human color perception. (Credit: Los Alamos National Laboratory)

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Hurricane Ian heads for Carolinas after pounding Florida

A revived Hurricane Ian set its sights on South Carolina's coast Friday and the historic city of Charleston, with forecasters predicting a storm surge and floods after the megastorm caused catastrophic damage in Florida and left people trapped in their homes.

Putin signs treaties annexing Ukrainian regions

Russian President Vladimir Putin signed treaties Friday to annex occupied areas of Ukraine and said he would use 'all available means' to protect the territory that Ukrainian and Western officials said Russia was claiming illegitimately and in violation of international law.

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