Scientific American Magazine

Two divergent measurements of how fast the universe is expanding cannot both be right. Something must give—but what?

A huge aerial campaign seeks to understand the effects of biomass smoke on human health

A long-disdained therapy that targets RNA is suddenly achieving spectacular success

For Sonia Minikel Vallabh and Eric Vallabh Minikel, the quest to prevent a fatal neurodegenerative disease is personal

Some scientists suspect that Roundup and milkweed loss aren’t the only culprits

Archaeologists have dated figurative rock art from Sulawesi to at least 43,900 years ago

White matter, the insulation around our neural wiring, plays a critical role in acquiring knowledge