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Climate

Cargo ships must cut their emissions in half by 2050

A new international agreement places a cap on greenhouse gas emissions from international cargo ships.

Archaeology

Tales of rampant suicide among Custer’s soldiers may be overblown

Few of Custer’s men killed themselves in the face of overwhelming Native American numbers at the Battle of the Little Bighorn, skeletal data suggest.

Health & Medicine

This is how norovirus invades the body

Norovirus targets a rare type of gut cell, a study in mice finds.

Genetics

Sweet potatoes might have arrived in Polynesia long before humans

Genetic analysis suggests that sweet potatoes were present in Polynesia over 100,000 years ago, and didn’t need help crossing the Pacific.